Author: Michael Koltai

Single-Ended Input Differential Output Amplifier

A DRV134 converts a single- ended input signal to a differential output. Differential output is used to drive the inputs of some A/D converters and to drive tristed- pair or Twinax transmission lines in a high- noise environment. An INA137 or INA137 can be used as a differential line receiver to convert the differential voltage back to single- ended. In AC- only applications such as audio, capacitors can be inserted between the outputs and their respective sense pins to reduce the DRV134 output DC offset. See the data sheet for details. Bypass capacitors have been omitted in this schematic but their use is recommended. (Circuit is created by Neil P. Albaugh, TI- Tucson )

Single-Ended Input Differential Output Amplifier  Circuit:

single ended diff opamp

Online Simulation of a Single-Ended Input Differential Output Amplifier  Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit yourself or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

PI Temperature Control Integrator

 

Proportional-integral response for control systems can be generated by a simple analog circuit. Feedback components R2, C2, & C1 together with input resistor R1 control the frequency response of U1. R3 is added to the circuit to provide feedback in a DC analysis and it is not necessary in an actual circuit. For stability, the control loop dominant pole should be formed by this integrator. (Circuit is created by Neil P. Albaugh, TI-Tucson)

PI Temperature Control Integrator circuit:

proportional integral temperature control integrator-blog

Online Simulation of a PI Temperature Control Integrator Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Very Low DC Offset Wideband Amplifier

The OPA380 is an integrator- stabilized operational amplifier that was developed primarily for transimpedance amplifier applications. Its inverting input is that a 90MHz CMOS op amp but its non-inverting input is an integrator non-inverting input, allowing only very low frequency response through this input. In most dual- supply applications, the OPA380 non- inverting input is simply tied to ground. In single- supply applications, it can be used to provide a DC offset. By adding an input resistor, R1, a transimpedance amplifier is transformed into a conventional inverting amplifier. The usual op amp inverting gain equation  applies: Av = – (R2/R1) in V/V. The OPA380 is input offset voltage is specified as 4uV typical, 25uV maximum @ 25C, drift is 0.03uV/C typ, 0.1uV/C max.  (Circuit is created by Neil P. Albaugh  TI- Tucson)

 Very Low DC Offset Wideband Amplifier circuit:

 Low vos wideband amplifier

Online Simulation of the Very Low DC Offset Wideband Amplifier Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Wideband 75MHz 28dB Gain Amplifier

This Wideband 75MHz 28dB Gain Amplifier circuit is based on two OPA355 gain stages in cascade. The dual version, OPA2355, can also be used. An OPA355 achieves low input bias current,
+/-50pA MAZ, low voltage noise, 5.8nV/sq-rt Hz typical @ 1MHz, and it has good gain-bandwidth, 200MHz, and high slew rate, 300V/us. To maximize bandwidth in a 2-stage amplifier, each stage should be set to a gain of the square- root of the total cascaded amplifier gain. A triple op amp, OPA3355 can be cascaded to provide even higher BW at the same gain. (Created by Neil P. Albaugh  TI- Tucson)

Wideband amplifier circuit:

wideband amplifier-blog

Online Simulation of the “Wideband 75MHz 28dB Gain Amplifier” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Avalanche Photodiode Driver

An avalanche photodiode (APD) typically requires a high reverse bias voltage to provide gain. An OPA445 can operate on +/-45V supplies but in this circuit we require only one polarity output voltage so the op amp is operated on assymetrical power supply voltages. This is permissable if the op amp common-mode voltage range is not exceeded. (Circuit is created by Neil P. Albaugh)

Avalanche Photodiode Driver circuit:

 

APD driver

 

Online Simulation of the “Avalanche Photodiode Driver” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Graeme Double Integrator

By placing the poles of two Tee networks (R1, C1, R2 & C2, R3, C3) at the same frequency, U1 performs double integration of its  input signal Vin. The gain of the circuit is dependent on the values of the R & C values. For additional information, see “Applications of Operational Amplifiers- Third- generation Techniques” by Jerald G. Graeme. In the absence of system feedback, R4 is used to close the loop to establish a DC operating point. It is not necessary in actual operation. (Circuit is created by Neil P. Albaugh,  TI – Tucson)
Graeme Double Integrator circuit:
Graemble Double Integrator-blog

Online Simulation of the “Graeme Double Integrator” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

1kHz 2nd-Order Bessel High-Pass Filter

This filter was designed using TI’s “FilterPro” software. The cutoff frequency and gain can be changed by editing this circuit with new RC values determined by FilterPro. This filter topology is inherently a phase inverting configuration. For a non- inverting low- pass filter use a Sallen- Key type. As shown, this filter is designed for use on a single power supply. For bipolar supplies, Voffset is not needed. Large value resistors– typical in low frequency filters– require a CMOS or JFET input op amp to minimize offset voltage errors. (Circuit is created by Neil P. Albaugh  TI-Tucson)

1kHz 2nd-Order Bessel High-Pass Filter circuit:

2nd oder Bessel LPF

Online Simulation of the “1kHz 2nd-Order Bessel High-Pass Filter” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Speech Compression Amplifier With Linear Gain = 20V/V

Compression amplifiers are frequently used to prevent overmodulation of AM transmitters. This prevents the creation of spurious modulation products called “splatter”. The “soft knee” of the transfer curve also imparts a “vacuum tube- like” sound to audio signals and musical instruments. The brightness of the LEDs indicate the degree of compression.  Bypass capacitors are not shown. (Circuit is created by Neil P. Albaugh,  TI-Tucson)

Speech Compression Amplifier With  Linear Gain = 20V/V circuit:

 

Speech Compression Amplifier-blog

Online Simulation of the “Speech Compression Amplifier With  Linear Gain = 20V/V” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

1 kHz Wien-Bridge Oscillator

The starting pulse is generated by the positive power supply’s startup slope.  If the power supply does not slew fast enough  the oscillator will not start. R3 can be increased to increase the gain and likelihood of starting.  It also increases distortion when  the amplitude as the peaks aproach the power supply rails. (Circuit is created by John Bishop  based on a design by Neil P. Albaugh.)

1 kHz Wien-Bridge Oscillator circuit:

1 khz wien-bridge oscillator

 

Online Simulation of the “1 kHz Wien-Bridge Oscillator” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video!

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS

Bridge Sensor Amplifier With RFI Filter

This high accuracy bridge sensor amplifier is based on the autozero INA326 instrumentation amplifier. Bridge sensors are commonly found in pressure transducers, weigh scales, strain guages, and load cells. As shown, the amplifier gain is 200V/V. Capacitors C1 & C2 form a 2nd order 1kHz low- pass filter to reduce noise. The INA326 is virtually free of 1/f noise. R8 & R9 together with C4, C5, & C6 form an RFI filter. For best filtering, make R8 = R9 and C5 = C6 as close as possible. C4 = C5 * 10. In battery- operated applications, an INA327 with shutdown is recommended. For operation over -40C to +125C, use an INA337. (Circuit is created by Neil P. Albaugh,  TI-Tucson)

The “Bridge Sensor Amplifier With RFI Filter” circuit:

bridge sensor amplifier with RFI filter blog

Online Simulation of the “Bridge Sensor Amplifier With RFI Filter” Circuit

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.

Click here to invoke TINACloud and analyze the circuit, or watch our tutorial video! 

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.

Michael Koltai
www.tina.com

Share and Enjoy

  • Facebook
  • Twitter
  • Delicious
  • LinkedIn
  • StumbleUpon
  • Add to favorites
  • Email
  • RSS