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OPA192: TINA simulate error when the Vcm =1/2 Vs

Betty Guo
Expert 7300 points
Part Number: OPA192
Other Parts Discussed in Thread: TINA-TI

Hi,

I use TINA to simulate OPA192 as inverter, and have a problem. the circuit as below.

VS =±3V，VCM=1/2 VS=1.5V, input is 1V/1k sin signal, gain=-1. The error as below:

could you help on it? also attached the TINA file. thanks.

sbom861c.tsc

  • 0
    Guru 48395 points

    Your V+ input will get a DC gain of 2 to the output trying to drive it into the 3V supply rail - that will not operate physically or in sim, need to pack that off some or increase the + supply.

  • 0
    TI__Expert 5810 points

    Hi, I have tried the transient analysis with your TINA model, and it didn't show this error. So what's the purpose of you to try this simulation?

    By the way, the magnitude of DC bias voltage (V1) you put is too large since your supply voltage is only 3 V. So the output voltage of opa192 will be limited to 3V, since it is rail-to-rail amplifier.

    So I suggest you change the DC bias voltage (V1) to 0.6V, then you will see good performance. 

    And I attach this two transient simulation results below respectively.

  • 0
    Guru 140200 points
    Hi Betty,

    the TINA-TI file you posted is not the file of your schematic. Can you post it?

    And what is the purpose of V1?

    Kai