Online Simulation

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

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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

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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

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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

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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

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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

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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

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INA154 With Gain-Current Shunt Amplifier

By converting the difference amplifier output to a current source using R2, voltage gain can be achieved with R3. R2 compensates the current sensing resistor R2 and increases the current source output impedance. Resistor R5 compensates for the current shunt resistance R4. Perfect compensation for R4 is not possible since the INA154’s internal resistor network is trimmed for precise ratios rather than absolute  values. A buffer amplifier should be used on the output to prevent gain (loading) error. Bypass capacitors are not shown.  (Circuit is created by Neil P. Albaugh,  TI-Tucson)

INA154 With Gain-Current Shunt Amplifier circuit:

INA-154 with Gain Current Shunt Amplifier-blog

Online Simulation of the “INA154 With Gain-Current Shunt 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

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Single Supply Absolute Value Amplifier (2)

The rail- to- rail input and output characteristics of these CMOS op amps allow them to swing very close to their supply rails–+5V and ground. By forcing U1 to operate as an inverting amplifier when the input voltage is negative (by the “ideal clamp” circuit of U2 and D1) and allowing it to operate as a normal noninverting amplifier when the input voltage is positive, op amp U1 acts like a perfect rectifier. This design can be biased above ground, handy in single supply circuits referenced to V+/2. This absolute value amplifier has unity gain an input range of within a few mV of -5V to +5V. For a faster amplifier, use an OPA354 for U1 & U2 and a small Schottky diode for D1. The dual amplifier versions, OPA2364 or OPA2354 can also be used. (Circuit is created by David Jones & Neil P. Albaugh,  TI- Tucson)
Single Supply Absolute Value Amplifier (2) circuit:
Absolute-value amplifier single-supply 2-blog

Online Simulation of the “Single Supply Absolute Value Amplifier (2)” 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

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Capacitive Load Demo

This “Capacitive Load Demo” circuit shows the utility of Tina- TI’s “Control Object” function. The series compensation resistor R1 is  stepped in values of 10, 30, and 50 ohms. The effect on the op amp’s overshoot is shown clearly in the plot below. Likewise, the compensation capacitor C1 or the load capacitance CL can be stepped in value and the effects evaluated. (Circuit is created by Neil P. Albaugh  TI – Tucson)

Capacitive Load Demo circuit:

Capacitive load demo-blog

Online Simulation of the “Capacitive Load Demo” 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

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