{"id":389,"date":"2018-04-06T10:26:21","date_gmt":"2018-04-06T10:26:21","guid":{"rendered":"https:\/\/www.tina.com\/resources\/?page_id=389"},"modified":"2018-07-09T08:34:39","modified_gmt":"2018-07-09T08:34:39","slug":"6-design-of-op-amp-circuits","status":"publish","type":"page","link":"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/","title":{"rendered":"6. Design of Op-amp Circuits"},"content":{"rendered":"<div class=\"top-navigation\">\n<div class=\"current-page\"><img decoding=\"async\" src=\"https:\/\/www.tina.com\/images\/resource\/people-location-30.png\" \/>CURRENT &#8211; 6. Design of Op-amp Circuits<\/div>\n<div class=\"previous-page\"><a href=\"https:\/\/www.tina.com\/resources\/home\/5-combined-inverting-and-non-inverting-inputs\/\"><img decoding=\"async\" src=\"https:\/\/www.tina.com\/images\/resource\/leftarrow5.png\" \/> PREVIOUS- 5. Combined inverting and non-inverting inputs<\/a><\/div>\n<div class=\"next-page\"><a href=\"https:\/\/www.tina.com\/resources\/home\/7-other-op-amp-applications\/\">NEXT- 7. Other op-amp applications<img decoding=\"async\" src=\"https:\/\/www.tina.com\/images\/resource\/rightarrow5.png\" \/><\/a><\/div>\n<div class=\"clear\"><\/div>\n<\/div>\n<p><script>\nfunction setStyle(){ \nheight = document.getElementsByClassName('entry-header')[0].clientHeight;\ndocument.getElementsByClassName('entry-header')[0].style.marginTop = height +\"px\";\ndocument.getElementsByClassName('top-navigation')[0].style.top = Math.round(-(height-20)*2) +\"px\";\n}\nsetStyle();\nwindow.onresize = function(event) {\nsetStyle();\n};\n<\/script><\/p>\n<p align=\"justify\"><strong><em><span style=\"font-size: 22px;\">Design of op-amp circuits<\/span><\/em><\/strong><\/p>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">Once the configuration of an op-amp system is given, we can <em>analyze<\/em> that system to determine the output in terms of the inputs. We perform this analysis using the procedure discussed earlier (in this chapter).<\/span><\/span><\/p>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">If you now wish to <em>design<\/em> a circuit that combines both inverting and non-inverting inputs, the problem is more complex. In a design problem, a desired linear equation is given, and the op-amp circuit must be designed. The desired output of the operational amplifier summer can be expressed as a linear combination of inputs,<\/span><\/span><\/p>\n<div id=\"attachment_264\" style=\"width: 404px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-264\" class=\"wp-image-264 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-30.png\" alt=\"\" width=\"394\" height=\"24\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-30.png 394w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-30-300x18.png 300w\" sizes=\"auto, (max-width: 394px) 100vw, 394px\" \/><p id=\"caption-attachment-264\" class=\"wp-caption-text\">(30)<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">where <em>X<sub>1<\/sub><\/em>, <em>X<sub>2<\/sub><\/em> &#8230;<em>X<sub>n<\/sub><\/em> are the desired gains at the non-inverting inputs and <em>Y<sub>a<\/sub><\/em>, <em>Y<sub>b<\/sub><\/em> &#8230;<em>Y<sub>m<\/sub><\/em> are the desired gains at the inverting inputs. Equation (30) is implemented with the circuit of Figure (14).<\/span><\/span><\/p>\n<div id=\"attachment_265\" style=\"width: 310px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-265\" class=\"wp-image-265 size-medium\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-14-300x201.png\" alt=\"Ideal Operational Amplifier, Design of op-amp circuits\" width=\"300\" height=\"201\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-14-300x201.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-14.png 356w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p id=\"caption-attachment-265\" class=\"wp-caption-text\">Figure 14- Multiple input summer<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">This circuit is a slightly modified version of the circuit of Figure (13) (<strong>Inverting and non-inverting inputs)<\/strong>. <\/span><\/span><\/p>\n<div id=\"attachment_217\" style=\"width: 310px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-217\" class=\"wp-image-217 size-medium\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-13-300x138.png\" alt=\"Ideal operational amplifier, operational amplifier\" width=\"300\" height=\"138\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-13-300x138.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-13.png 446w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p id=\"caption-attachment-217\" class=\"wp-caption-text\">Figure 13- Inverting and non-inverting inputs<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">The only change we have made is to include resistors between the op-amp inputs and ground. The ground can be viewed as an additional input of zero volts connected through the corresponding resistor (<em>R<sub>y<\/sub><\/em> for the inverting input and <em>R<sub>x<\/sub><\/em> for the non-inverting input). The addition of these resistors gives us flexibility in meeting any requirements beyond those of Equation (30). For example, the input resistances might be specified. Either or both of these additional resistors can be removed by letting their values go to infinity.<\/span><\/span><\/p>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">Equation (29) from the previous section shows that the values of the resistors, <em>R<sub>a<\/sub><\/em>, <em>R<sub>b<\/sub><\/em>, &#8230;<em>R<sub>m<\/sub><\/em> and <em>R<sub>1<\/sub><\/em>, <em>R<sub>2<\/sub><\/em>, &#8230;<em>R<sub>n<\/sub><\/em> are inversely proportional to the desired gains associated with the respective input voltages. In other words, if a large gain is desired at a particular input terminal, then the resistance at that terminal is small.<\/span><\/span><\/p>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">When the open loop gain of the operational amplifier, <em>G<\/em>, is large, the output voltage may be written in terms of the resistors connected to the operational amplifier as in Equation (29) . Equation (31) repeats this expression with slight simplification and with addition of the resistors to ground.<\/span><\/span><\/p>\n<div id=\"attachment_320\" style=\"width: 395px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-320\" class=\"wp-image-320 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-31.png\" alt=\"\" width=\"385\" height=\"48\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-31.png 385w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-31-300x37.png 300w\" sizes=\"auto, (max-width: 385px) 100vw, 385px\" \/><p id=\"caption-attachment-320\" class=\"wp-caption-text\">(31)<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">We define two equivalent resistances as follows:<\/span><\/span><\/p>\n<div id=\"attachment_322\" style=\"width: 212px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-322\" class=\"wp-image-322 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-32.png\" alt=\"\" width=\"202\" height=\"76\" \/><p id=\"caption-attachment-322\" class=\"wp-caption-text\">(32)<\/p><\/div>\n<p><em><strong><u>APPLICATION<\/u><\/strong><\/em><\/p>\n<p>Analyze the following circuit using TINACloud to determine\u00a0V<em><sub>out<\/sub><\/em>\u00a0in terms of the input voltages by clicking the link below.<\/p>\n<div id=\"attachment_3597\" style=\"width: 918px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3597\" class=\"wp-image-3597 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/07\/MultipleInputSummerResources.png\" alt=\"Multiple Input Summer Circuit Simulation by TINACloud\" width=\"908\" height=\"417\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/07\/MultipleInputSummerResources.png 908w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/07\/MultipleInputSummerResources-300x138.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/07\/MultipleInputSummerResources-768x353.png 768w\" sizes=\"auto, (max-width: 908px) 100vw, 908px\" \/><p id=\"caption-attachment-3597\" class=\"wp-caption-text\">Multiple Input Summer Circuit Simulation by TINACloud<\/p><\/div>\n<p><a href=\"https:\/\/www.tinacloud.com\/tinademo\/tina.php?c=5b0fda5a762c7:976088&amp;amp;act;act=&amp;amp;noad&amp;amp;inframe=https%3A%2F%2Fwww.tina.com\" target=\"_blank\" rel=\"noopener\"><em><strong><span style=\"color: #466ce0;\"><em><strong>Multiple Input Summer Circuit Simulation by TINACloud <\/strong><\/em><\/span><\/strong><\/em><\/a><\/p>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">We see that the output voltage is a linear combination of inputs where each input is divided by its associated resistance and multiplied by another resistance. The multiplying resistance is <em>R<sub>F<\/sub><\/em> for inverting inputs and <em>R<sub>eq<\/sub><\/em> for non-inverting inputs.<\/span><\/span><\/p>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">The number of unknowns in this problem is <em>n+m+<\/em>3 (i.e. the unknown resistor values). We therefore need to develop <em>n+m+<\/em>3 equations in order to solve for these unknowns. We can formulate <em>n+m<\/em> of these equations by matching the given coefficients in Equation (30) . That is, we simply develop the system of equations from Equations (30), (31) and (32)as follows:<\/span><\/span><\/p>\n<div style=\"width: 198px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-327 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-33.png\" alt=\"\" width=\"188\" height=\"90\" \/><p class=\"wp-caption-text\">(33)<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">Since we have three more unknowns, we have the flexibility to satisfy three more constraints. Typical additional constraints include input resistance considerations and having reasonable values for the resistors (e.g., You would not want to have to use a precision resistor for <em>R<sub>1<\/sub><\/em> equal to 10<sup>-4<\/sup> ohms!).<\/span><\/span><\/p>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">Although not required for design using ideal op-amps, we will use a design constraint that is important for non-ideal op-amps. For the non-inverting op-amp, the Thevenin resistance looking back from the inverting input is usually made equal to that looking back from the non-inverting input. For the configuration shown in Figure (14), this constraint can be expressed as follows:<\/span><\/span><\/p>\n<div id=\"attachment_330\" style=\"width: 339px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-330\" class=\"wp-image-330 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-34.png\" alt=\"\" width=\"329\" height=\"29\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-34.png 329w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-34-300x26.png 300w\" sizes=\"auto, (max-width: 329px) 100vw, 329px\" \/><p id=\"caption-attachment-330\" class=\"wp-caption-text\">(34)<span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\"><br \/><\/span><\/span><\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\"> The last equality results from the definition of <em>R<sub>A<\/sub> <\/em>from Equation (32). Substituting this result into Equation (31) yields the constraint,<\/span><\/span><\/p>\n<div id=\"attachment_333\" style=\"width: 159px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-333\" class=\"wp-image-333 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-35.png\" alt=\"\" width=\"149\" height=\"48\" \/><p id=\"caption-attachment-333\" class=\"wp-caption-text\">(35)<\/p><\/div>\n<div id=\"attachment_335\" style=\"width: 74px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-335\" class=\"wp-image-335 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-36.png\" alt=\"\" width=\"64\" height=\"26\" \/><p id=\"caption-attachment-335\" class=\"wp-caption-text\">(36)<span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\"><br \/><\/span><\/span><\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\"> Substituting this result into Equation (33) yields the simple set of equations,<\/span><\/span><\/p>\n<div style=\"width: 202px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-338 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-37.png\" alt=\"\" width=\"192\" height=\"89\" \/><p class=\"wp-caption-text\">(37)<span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\"><br \/><\/span><\/span><\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\"> The combinations of Equation (34) and Equation (37) give us the necessary information to design the circuit. We select a value of <em>R<sub>F<\/sub><\/em> and then solve for the various input resistors using Equation (37) . If the values of the resistors are not in a practical range, we go back and change the value of the feedback resistor. Once we solve for the input resistors, we then use Equation (34) to force the resistances to be equal looking back from the two op-amp inputs. We select values of <em>R<sub>x<\/sub><\/em> and <em>R<sub>y<\/sub><\/em> to force this equality. While Equations\u00a0 (34) and (37) contain the essential information for the design, one important consideration is whether or not to include the resistors between the op-amp inputs and ground (<em>R<sub>x<\/sub><\/em> and <em>R<sub>y<\/sub><\/em>). The solution may require iterations to obtain meaningful values (i.e. you may perform the solution one time and come up with negative resistance values). For this reason, we present a numerical procedure which simplifies the amount of calculations<a href=\"#_ftn1\" name=\"_ftnref1\"><sup>[1]<\/sup><\/a><\/span><\/span><\/p>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">Equation (34) can be rewritten as follows:<\/span><\/span><\/p>\n<div id=\"attachment_345\" style=\"width: 194px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-345\" class=\"wp-image-345 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-38.png\" alt=\"\" width=\"184\" height=\"45\" \/><p id=\"caption-attachment-345\" class=\"wp-caption-text\">(38)<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">Substituting Equation (37) into Equation (38) we obtain,<\/span><\/span><\/p>\n<div id=\"attachment_346\" style=\"width: 231px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-346\" class=\"wp-image-346 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-39.png\" alt=\"\" width=\"221\" height=\"45\" \/><p id=\"caption-attachment-346\" class=\"wp-caption-text\">(39)<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">Recall that our goal is to solve for the resistors values in terms of <em>X<sub>i<\/sub><\/em> and <em>Y<sub>j<\/sub><\/em><sub>. <\/sub>Let us define summation terms as follows:<\/span><\/span><\/p>\n<div id=\"attachment_347\" style=\"width: 76px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-347\" class=\"wp-image-347 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-40.png\" alt=\"\" width=\"66\" height=\"88\" \/><p id=\"caption-attachment-347\" class=\"wp-caption-text\">(40)<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">We can then rewrite Equation (39) as follows:<\/span><\/span><\/p>\n<div id=\"attachment_348\" style=\"width: 190px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-348\" class=\"wp-image-348 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-41.png\" alt=\"\" width=\"180\" height=\"45\" \/><p id=\"caption-attachment-348\" class=\"wp-caption-text\">(41)<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">This is a starting point for our design procedure. Recall that <em>R<sub>x<\/sub><\/em> and <em>R<sub>y<\/sub><\/em> are the resistors\u00a0between ground and the non-inverting and inverting inputs, respectively. The feedback resistor is denoted <em>R<sub>F<\/sub><\/em> and a new term, <em>Z<\/em>, is defined as<\/span><\/span><\/p>\n<div id=\"attachment_351\" style=\"width: 106px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-351\" class=\"wp-image-351 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp2-42.png\" alt=\"\" width=\"96\" height=\"26\" \/><p id=\"caption-attachment-351\" class=\"wp-caption-text\">(42)<\/p><\/div>\n<p><a href=\"#_ftnref1\" name=\"_ftn1\"><\/a><\/p>\n<div id=\"attachment_352\" style=\"width: 477px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-352\" class=\"wp-image-352 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp-Table1.png\" alt=\"\" width=\"467\" height=\"158\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp-Table1.png 467w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/03\/Opamp-Table1-300x101.png 300w\" sizes=\"auto, (max-width: 467px) 100vw, 467px\" \/><p id=\"caption-attachment-352\" class=\"wp-caption-text\">Table (1)-Summing Amplifier Design<\/p><\/div>\n<p align=\"justify\"><span style=\"font-family: Bodoni MT, serif;\"><span style=\"font-size: large;\">We can eliminate either or both of the resistors, <em>R<sub>x<\/sub><\/em> and <em>R<sub>y<\/sub><\/em>, from the circuit of Figure (14). That is, either or both of these resistors can be set to infinity (i.e., open-circuited). This yields three design possibilities. Depending on the desired multiplying factors relating output to input, one of these cases will yield the appropriate design. The results are summarized in Table (1).\u00a0<\/span><\/span><\/p>\n<h6 align=\"justify\"><strong>Circuit design with TINA and TINACloud<\/strong><\/h6>\n<p>There are several tools available in TINA and TINACloud for operational amplifier and circuit design.<\/p>\n<p><strong>Optimization<\/strong><\/p>\n<p><strong>TINA<\/strong>&#8216;s Optimization Mode unknown circuit parameters can be determined automatically so that the network can produce a predefined target output value, minimum or maximum. Optimization is useful not only in circuit design, but in teaching, to construct examples and problems. Note that this tool works not only for ideal op-amps and linear circuit, but for any nonlinear circuit with real nonlinear and other device models.<\/p>\n<p>Consider the inverting amplifier circuit with a real operational amplifier OPA350.<\/p>\n<p>By the default setting of this circuit the output voltage of the circuit is 2.5<\/p>\n<p>You can easily check this by pressing the DC button in TINACloud.<\/p>\n<p><em><strong><u>APPLICATION<\/u><\/strong><\/em><\/p>\n<p>Analyze the following circuit using the TINACloud online circuit simulator to determine\u00a0V<em><sub>out<\/sub><\/em>\u00a0in terms of the input voltages by clicking the link below.<\/p>\n<div id=\"attachment_3603\" style=\"width: 921px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3603\" class=\"wp-image-3603 size-full\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/07\/SamplecircuitOPA350-2.png\" alt=\"OPA350 Circuit Simulation with TINACloud\" width=\"911\" height=\"411\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/07\/SamplecircuitOPA350-2.png 911w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/07\/SamplecircuitOPA350-2-300x135.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/07\/SamplecircuitOPA350-2-768x346.png 768w\" sizes=\"auto, (max-width: 911px) 100vw, 911px\" \/><p id=\"caption-attachment-3603\" class=\"wp-caption-text\">OPA350 Circuit Simulation with TINACloud<\/p><\/div>\n<p><a href=\"https:\/\/www.tinacloud.com\/tinademo\/tina.php?c=5b1628a1c6930:431504&amp;amp;act;act=&amp;amp;noad&amp;amp;inframe=https%3A%2F%2Fwww.tina.com\" target=\"_blank\" rel=\"noopener\"><em><strong><span style=\"color: #466ce0;\"><em><strong>OPA350 Circuit Simulation with TINACloud <\/strong><\/em><\/span><\/strong><\/em><\/a><\/p>\n<div style=\"clear: both;\"><\/div>\n<div>Now assume that we want to set this voltage by changing the Vref voltage in the schematic design.<\/div>\n<p>If order to prepare this we should select the target Out=3V and circuit parameter to be determined (Optimization Object) Vref. For this object we should also define a region which helps the search but also represents the constraints.<\/p>\n<p>To select and set the Optimization target in TINACloud click Vout Voltage pin and set the Optimization Target to Yes<\/p>\n<p>Next click the \u2026 button in the same line and set the Value to 3.<\/p>\n<p>Press OK in each dialog to finish the settings.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-1m\/#main\" rel=\"attachment wp-att-2896\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2896 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-1M.png\" alt=\"\" width=\"919\" height=\"540\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-1M.png 919w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-1M-300x176.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-1M-768x451.png 768w\" sizes=\"auto, (max-width: 919px) 100vw, 919px\" \/><\/a><\/p>\n<p><strong>Now let\u2019s\u00a0 select and set the Vref Optimization Object.<\/strong><\/p>\n<p>Click Vref then the \u2026 button in the same line<\/p>\n<p>Select Optimization Object in the list on he top and set the Optimization\/Object checkbox.<\/p>\n<p>Press OK in both dialogs.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-5m\/#main\" rel=\"attachment wp-att-2899\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2899 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-5M.png\" alt=\"\" width=\"913\" height=\"547\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-5M.png 913w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-5M-300x180.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-5M-768x460.png 768w\" sizes=\"auto, (max-width: 913px) 100vw, 913px\" \/><\/a><\/p>\n<p>If the Optimization settings were successfully you will see a &gt;&gt; sign at Out and a &lt;&lt; sign at Vref as shown below.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-6m\/#main\" rel=\"attachment wp-att-2901\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2901 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-6M.png\" alt=\"\" width=\"913\" height=\"577\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-6M.png 913w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-6M-300x190.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-6M-768x485.png 768w\" sizes=\"auto, (max-width: 913px) 100vw, 913px\" \/><\/a><\/p>\n<p>Now select Optimization from the Analysis menu and press RUN in the Optimization dialog box.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-7m\/#main\" rel=\"attachment wp-att-2902\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2902 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-7M.png\" alt=\"\" width=\"917\" height=\"588\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-7M.png 917w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-7M-300x192.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-7M-768x492.png 768w\" sizes=\"auto, (max-width: 917px) 100vw, 917px\" \/><\/a><\/p>\n<p>After completing the Optimization the found Vref, the Optimum Value, will be shown in the DC Optimization dialog<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-8m\/#main\" rel=\"attachment wp-att-2903\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2903 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-8M.png\" alt=\"\" width=\"915\" height=\"513\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-8M.png 915w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-8M-300x168.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-8M-768x431.png 768w\" sizes=\"auto, (max-width: 915px) 100vw, 915px\" \/><\/a><\/p>\n<p><strong>You can study the settings and run the Optimization online and check by Circuit Simulation using the link below.<\/strong><br \/>\nRun Optimization from the Analysis menu then press the DC button so see the result in the Optimized circuit (3V)<\/p>\n<p><a href=\"https:\/\/www.tinacloud.com\/tinademo\/tina.php?c=5b152d73e249d:431664&amp;amp;act;act=&amp;amp;noad&amp;amp;inframe=https%3A%2F%2Fwww.tina.com\" target=\"_blank\" rel=\"noopener\"><em><strong><span style=\"color: #466ce0;\"><em><strong>Online Optimization and Circuit Simulation with TINACloud <\/strong><\/em><\/span><\/strong><\/em><\/a><\/p>\n<div><\/div>\n<p>Note that at this time in TINACloud only a simple DC optimization is included. More optimizations features are included in the offline version of TINA.<\/p>\n<p><strong>AC Optimization<\/strong><\/p>\n<p>Using the offline version of TINA you can optimize and redesign AC circuits as well.<\/p>\n<p>Open the MFB 2nd Order Chebyshev LPF.TSC low-pass circuit, from the <em>Examples\\Texas Instruments\\Filters_FilterPro folder of TINA<\/em>, shown below.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-24chebyshev1-2\/#main\" rel=\"attachment wp-att-2988\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2988 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-24Chebyshev1-1.png\" alt=\"\" width=\"907\" height=\"548\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-24Chebyshev1-1.png 907w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-24Chebyshev1-1-300x181.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-24Chebyshev1-1-768x464.png 768w\" sizes=\"auto, (max-width: 907px) 100vw, 907px\" \/><\/a><\/p>\n<p>Run AC Analysis\/AC Transfer Characteristic.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev2\/#main\" rel=\"attachment wp-att-2989\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2989 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev2.png\" alt=\"\" width=\"900\" height=\"544\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev2.png 900w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev2-300x181.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev2-768x464.png 768w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/a><\/p>\n<p>The following diagram will appear:<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev3\/#main\" rel=\"attachment wp-att-2990\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2990 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev3.png\" alt=\"\" width=\"536\" height=\"428\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev3.png 536w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev3-300x240.png 300w\" sizes=\"auto, (max-width: 536px) 100vw, 536px\" \/><\/a><\/p>\n<p>The circuit has unity (0dB) Gain and 1.45kHz Cutoff frequency.<\/p>\n<p><strong>Now let\u2019s redesign the circuit using AC Optimization and<\/strong> <strong>set the low frequency Gain to 6dB and the Cutoff frequency to 900Hz.<\/strong><\/p>\n<p><strong>Note<\/strong> that normally the optimization tool applicable for changes only. In case of filters you may want to use rather a filter design tool. We will deal with that topic later.<\/p>\n<p>Now using Optimization the Gain and the Cutoff frequency are the Optimization targets.<\/p>\n<p>Click the &#8220;Select Optimization Target&#8221; icon on the toolbar or on the Analysis menu \u201cSelect Optimization Target\u201d<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev6-2\/#main\" rel=\"attachment wp-att-2995\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2995\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev6-1.png\" alt=\"\" width=\"1431\" height=\"586\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev6-1.png 1431w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev6-1-300x123.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev6-1-768x314.png 768w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev6-1-1024x419.png 1024w\" sizes=\"auto, (max-width: 1431px) 100vw, 1431px\" \/><\/a><\/p>\n<p>The cursor will change into the icon:\u00a0<a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimization-target-icon\/#main\" rel=\"attachment wp-att-2997\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2997 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/Optimization-Target-icon.png\" alt=\"\" width=\"27\" height=\"27\" \/><\/a>. Click the Vout Voltage pin with the new cursor symbol.<\/p>\n<p>The following dialog will appear:<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev7\/#main\" rel=\"attachment wp-att-3000\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3000 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev7.png\" alt=\"\" width=\"710\" height=\"423\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev7.png 710w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev7-300x179.png 300w\" sizes=\"auto, (max-width: 710px) 100vw, 710px\" \/><\/a><\/p>\n<p>Click the AC Goal Functions Buttons. The following dialog will appear:<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev9\/#main\" rel=\"attachment wp-att-3003\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3003\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev9.png\" alt=\"\" width=\"1453\" height=\"291\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev9.png 1453w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev9-300x60.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev9-768x154.png 768w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev9-1024x205.png 1024w\" sizes=\"auto, (max-width: 1453px) 100vw, 1453px\" \/><\/a><\/p>\n<p>Check the Low Pass checkbox and set the Target cut-off frequency to <strong>900<\/strong>.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Now check the Maximum checkbox and set the Target to <strong>6<\/strong>.<\/p>\n<p>Next select the circuit parameters which you want to change to reach the Optimization targets.<\/p>\n<p>Click the\u00a0<a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimization-select-control-object-icon\/#main\" rel=\"attachment wp-att-3010\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3010 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/Optimization-Select-control-object-icon.png\" alt=\"\" width=\"27\" height=\"31\" \/><\/a> \u00a0symbol or the Select Control Object line on the Analysis menu.<\/p>\n<p>The cursor will change to the symbol above. Click the C1 capacitor with this new cursor. The following dialog will appear:<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev15-2\/#main\" rel=\"attachment wp-att-3022\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3022 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev15-1.png\" alt=\"\" width=\"903\" height=\"545\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev15-1.png 903w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev15-1-300x181.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev15-1-768x464.png 768w\" sizes=\"auto, (max-width: 903px) 100vw, 903px\" \/><\/a><\/p>\n<p>Press the select button. The following dialog will appear:<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev11\/#main\" rel=\"attachment wp-att-3013\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3013 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev11.png\" alt=\"\" width=\"1284\" height=\"371\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev11.png 1284w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev11-300x87.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev11-768x222.png 768w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev11-1024x296.png 1024w\" sizes=\"auto, (max-width: 1284px) 100vw, 1284px\" \/><\/a><\/p>\n<p>The program automatically sets a range (constraint) where the Optimum value will be searched. End value to 20n as shown above.<\/p>\n<p>Now repeat the same procedure for R2. \u00a0Set the End value to 20k.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev16-2\/#main\" rel=\"attachment wp-att-3029\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3029 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev16-1.png\" alt=\"\" width=\"903\" height=\"572\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev16-1.png 903w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev16-1-300x190.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev16-1-768x486.png 768w\" sizes=\"auto, (max-width: 903px) 100vw, 903px\" \/><\/a><\/p>\n<p>After finishing the Optimization setup, select Optimization\/AC Optimization(Transfer) from the Analysis menu.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev17\/#main\" rel=\"attachment wp-att-3032\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3032 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev17.png\" alt=\"\" width=\"907\" height=\"584\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev17.png 907w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev17-300x193.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev17-768x495.png 768w\" sizes=\"auto, (max-width: 907px) 100vw, 907px\" \/><\/a><\/p>\n<p>The following dialog will appear:<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev12\/#main\" rel=\"attachment wp-att-3015\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3015 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev12.png\" alt=\"\" width=\"544\" height=\"446\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev12.png 544w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev12-300x246.png 300w\" sizes=\"auto, (max-width: 544px) 100vw, 544px\" \/><\/a><\/p>\n<p>Accept the default settings by pressing OK.<\/p>\n<p>After a short calculation the optimum is found and changed component parameters appear:<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev13\/#main\" rel=\"attachment wp-att-3018\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3018 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev13.png\" alt=\"\" width=\"309\" height=\"256\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev13.png 309w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev13-300x249.png 300w\" sizes=\"auto, (max-width: 309px) 100vw, 309px\" \/><\/a><\/p>\n<p>Finally check the result with circuit simulation running Run AC Analysis\/AC Transfer Characteristic.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-25chebyshev14\/#main\" rel=\"attachment wp-att-3019\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3019 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev14.png\" alt=\"\" width=\"627\" height=\"531\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev14.png 627w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-25Chebyshev14-300x254.png 300w\" sizes=\"auto, (max-width: 627px) 100vw, 627px\" \/><\/a><\/p>\n<p>As shown on the diagram the target values (Gain 6db, Cut-off frequency 900Hz) have been reached.<\/p>\n<p><strong>Using the Circuit Designer Tool in TINA and TINACloud<\/strong><\/p>\n<p>Another method of method of designing circuits in TINA and TINAcloud is using the built is Circuit Designer tool called simply Design Tool.<\/p>\n<p>Design Tool works with the design equations of your circuit to ensure that the specified inputs result in the specified output response. The tool requires of you a statement of inputs and outputs and the relationships among the component values. The tool offers you a solution engine that you can use to solve repetitively and accurately for various scenarios. The calculated component values are automatically set in place in the schematic and you can check the result by simulation.<\/p>\n<p>Let\u2019s design the AC amplification of the same circuit using our Circuit Designer tool.<\/p>\n<p>Open the circuit from the Design Tool folder of TINACloud. The following screen will appear.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-beallitottkep\/#main\" rel=\"attachment wp-att-2944\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2944 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-Beallitottkep.png\" alt=\"\" width=\"1015\" height=\"538\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-Beallitottkep.png 1015w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-Beallitottkep-300x159.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-Beallitottkep-768x407.png 768w\" sizes=\"auto, (max-width: 1015px) 100vw, 1015px\" \/><\/a><\/p>\n<p>Now let\u2019s run AC Analysis \/AC Transfer Characteristic.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-17\/#main\" rel=\"attachment wp-att-2924\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2924 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-17.png\" alt=\"\" width=\"912\" height=\"562\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-17.png 912w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-17-300x185.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-17-768x473.png 768w\" sizes=\"auto, (max-width: 912px) 100vw, 912px\" \/><\/a><\/p>\n<p>The following diagram will appear:<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-18-acdiagram\/#main\" rel=\"attachment wp-att-2925\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2925 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-18-ACDiagram.png\" alt=\"\" width=\"912\" height=\"542\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-18-ACDiagram.png 912w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-18-ACDiagram-300x178.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-18-ACDiagram-768x456.png 768w\" sizes=\"auto, (max-width: 912px) 100vw, 912px\" \/><\/a><\/p>\n<p>Now let\u2019s redesign the circuit to have unity gain (0dB)<\/p>\n<p>Invoke the Redesign this Circuit from the Tools menu<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-19\/#main\" rel=\"attachment wp-att-2928\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2928 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-19.png\" alt=\"\" width=\"918\" height=\"535\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-19.png 918w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-19-300x175.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-19-768x448.png 768w\" sizes=\"auto, (max-width: 918px) 100vw, 918px\" \/><\/a><\/p>\n<p>The following dialog will appear.<\/p>\n<p>Set Gain to -1 (0 dB) and press the Run button.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-20mm\/#main\" rel=\"attachment wp-att-2936\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2936 size-full alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-20MM.png\" alt=\"\" width=\"915\" height=\"276\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-20MM.png 915w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-20MM-300x90.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-20MM-768x232.png 768w\" sizes=\"auto, (max-width: 915px) 100vw, 915px\" \/><\/a><\/p>\n<p>The calculated new component values will immediately appear in the schematic editor, drawn in red color.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-21\/#main\" rel=\"attachment wp-att-2935\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2935 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-21.png\" alt=\"\" width=\"918\" height=\"538\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-21.png 918w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-21-300x176.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-21-768x450.png 768w\" sizes=\"auto, (max-width: 918px) 100vw, 918px\" \/><\/a><\/p>\n<p>Press the Accept button.<\/p>\n<p>The changes will be finalized. Run AC Analysis \/AC Transfer Characteristics again to check the redesigned circuit.<\/p>\n<p><a href=\"https:\/\/www.tina.com\/resources\/home\/ideal-operational-amplifiers-2\/6-design-of-op-amp-circuits\/optimizationopa350-23m\/#main\" rel=\"attachment wp-att-2948\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2948 alignnone\" src=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-23M.png\" alt=\"\" width=\"918\" height=\"520\" srcset=\"https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-23M.png 918w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-23M-300x170.png 300w, https:\/\/www.tina.com\/resources\/wp-content\/uploads\/2018\/06\/OptimizationOPA350-23M-768x435.png 768w\" sizes=\"auto, (max-width: 918px) 100vw, 918px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p align=\"justify\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<\/p>\n<p align=\"justify\"><a href=\"https:\/\/www.tina.com\/resources\/wp-admin\/post.php?post=389&amp;action=edit#_ftnref1\" name=\"_ftn1\"><\/a><sup>1<\/sup><span style=\"display: inline !important; float: none; background-color: transparent; color: #000000; cursor: text; font-family: 'NobileRegular',sans-serif; font-size: 12px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;\">This technique was devised by Phil Vrbancic, a student at California State University, Long Beach, and presented in a paper submitted to the IEEE Region VI Prize Paper Contest.<\/span><\/p>\n<div class=\"previous-page\"><a href=\"https:\/\/www.tina.com\/resources\/home\/5-combined-inverting-and-non-inverting-inputs\/\"><img decoding=\"async\" src=\"https:\/\/www.tina.com\/images\/resource\/leftarrow5.png\" \/>PREVIOUS- 5. Combined inverting and non-inverting inputs<\/a><\/div>\n<div class=\"next-page\"><a href=\"https:\/\/www.tina.com\/resources\/home\/7-other-op-amp-applications\/\">NEXT- 7. Other op-amp applications<img decoding=\"async\" src=\"https:\/\/www.tina.com\/images\/resource\/rightarrow5.png\" \/><\/a><\/div>\n<div class=\"clear\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>CURRENT &#8211; 6. Design of Op-amp Circuits PREVIOUS- 5. Combined inverting and non-inverting inputs NEXT- 7. Other op-amp applications Design of op-amp circuits Once the configuration of an op-amp system is given, we can analyze that system to determine the output in terms of the inputs. We perform this analysis using the procedure discussed earlier [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1357,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"yst_prominent_words":[318,216,316,317,278,290,281,292,313,315,319,311,309,320,314,312,323,220,321,310],"class_list":["post-389","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/pages\/389","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/comments?post=389"}],"version-history":[{"count":147,"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/pages\/389\/revisions"}],"predecessor-version":[{"id":3615,"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/pages\/389\/revisions\/3615"}],"up":[{"embeddable":true,"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/pages\/1357"}],"wp:attachment":[{"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/media?parent=389"}],"wp:term":[{"taxonomy":"yst_prominent_words","embeddable":true,"href":"https:\/\/www.tina.com\/resources\/wp-json\/wp\/v2\/yst_prominent_words?post=389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}