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active telephone hybrid with opamp

Shuhrat Rahimov
Prodigy 200 points

Hello,

I wanted to simulate active telephone hybrid implemented with opampm in Tina TI. schematics can be found in attachment.  I think I am giving wrong values for the circuit elements and my simulation results seet to be strange. Please, could somebody help me with my simulation

Kind7041.2043.active_hybrid.TSC regards

  • 0
    TI__Guru**** 189401 points

    Hi, Shuhrat,

    I am going to move your post to the modeling e2e.

    -d2

  • 0
    TI__Mastermind 40295 points

    Shuhrat,

    Pin 2 oof the model is used to set the output coommon-mode voltage and is unterminated in your circuit. Please try setting the pin 2 voltage to mid-supply, which is ground for your chosen power supplies.

    Also, fully differential amplifiers are usually operated with feedback paths from each output to the input of opposite sign. This helps stabilize the amplifier's operating point.
    For your circuit, you might consider adding some resistors beteeen pins 5 and 3, much as you did between pins 4 and 1.

    That might help with the results.

    Regards,
    John

  • 0 in reply to John Miller - Sensing
    Prodigy 200 points

    Hi, John

    Thanks for the reply. I did the suggested improvements. Now I have the same signals on bothe inv and noninv inputs of the amplifier. I thought that in output the difference (in my case zero) should come out, which is not the case. Could you please look at my schematics, which I attach

    Regards,

    Shuhrat

    6082.active_hybrid.TSC