Month: March 2015

Voltage-Controlled Electronic Load

This circuit is a voltage- controlled current sink. It is scaled to provide a 500mA output current with a +1V input voltage. This type of current sink can be very useful in power supply testing applications. A R-R output op amp with an input common-mode range that includes its negative supply rail, such as an OPA251, is required for single- supply operation. Re- scaling this circuit with other Darlington transistors or low- threshold N-channel MOSFETs can result in an output current sink capability of many amps. (Circuit is created by Neil P. Albaugh,  TI – Tucson)

Voltage-Controlled Electronic Load circuit:

voltage-contolled electronic load-blog

 

Online Simulation of the Voltage-Controlled Electronic Load 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

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Differential Amplifier Resistor Tolerance Analysis

Make all resistors “Control Objects” and use “Parameter Stepping” to step each resistor value from 9.9k (1% low) to 10.1k (1% high) in 3 linear steps. Run DC Analysis, “DC Transfer Characteristic” and sweep “Vcmv” from -1V to +1V. The resulting family of curves shows the differential amplifier output error due to the various resistor tolerance combinations. The OPA277 error contribution is nil. Note that using 1% resistors in a differential amplifier design can result in a worst- case CMRR error of 20mV per volt of common-mode voltage. This is only 36dB! (Circuit is created Neil P. Albaugh  TI-Tucson)

Differential Amplifier Resistor Tolerance Analysis Circuit:

Diff Amp R tolerance Analysis-blog

 

Online Simulation of the Differential Amplifier Resistor Tolerance Analysis 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

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  • Twitter
  • Delicious
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  • StumbleUpon
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