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TINA/Spice/INA333: How to simulate and plot CMRR & AC analysis of the following circuit?

Lin YS
Prodigy 10 points
Part Number: INA333
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hi, 

I am trying to simulate the ECG application circuit of INA333.

I want to how how to simulate the CMRR and AC analysis of the circuit, however, I don't know how to set up the input setting in TINA.

I've reduce the input buffer and Right leg circuit as following, please tell me how to get the CMRR and AC analysis of following circuit.

I've read the video below, but I still don't know how the get CMRR plot in the circuit. 

training.ti.com/ti-precision-labs-op-amps-common-mode-rejection

ECG_preAmp_2.TSC

  • 0
    TI__Genius 9775 points
    Hi Lin,

    The .TSC you attached as well your picture, that can be used for the AC Analysis, simply run: Analysis -> AC Analysis -> Run AC Transfer Characteristic, the look at the output at "Vout" pin.

    For CMRR, simply move your VIN voltage generator to be in series with Vcm. Then the the open wire between "+" and "-" terminal of the INA333, short them out. Then run ac analysis again, measure the output at "Vout" pin.

    Herman