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THS4524: THS4524

user5246204
Prodigy 80 points
Part Number: THS4524

Dear all,

I am looking to perform a fully differential integrator, wit the THS4524 of TI.

Performing some simulation into TINA a got a pretty cool model of integrator. I seems to be too easy. So please, your comment and help are welcome

  • 0
    TI__Expert 7875 points
    Hi,

    The biggest risk you would have with your circuit is stability. If you can attach the TINA file, I would be happy to run a stability simulation for you.

    Regards,
  • 0 in reply to Jacob Freet
    TI__Genius 15975 points

    Hi,

    As Jacob mentioned, stability of your circuit could be the primary issue for the integrator. If we do the stability analysis of your circuit, it does look like the intersection of THS4524 open loop gain curve (THS452x_Aol) with the Noise Gain curve is at -20dB/decade indicating a stable circuit. Normally, if the intersection is at > -20dB/decade (or say -40dB/decade), it is then possible that the amplifier is unstable. But, I believe this wont be the case with the integrator circuit because the THS452x is unity gain stable and the minimum Noise Gain for your circuit is essentially 1V/V or 0dB.

    To learn more about the FDA stability - especially Noise Gain and Open Loop gain and how their interaction affects stability (if you are new to the FDA world), I would recommend going through the TI Precision labs video here:

    Best Regards,

    Rohit

  • 0 in reply to Rohit Bhat
    Prodigy 80 points

    Hello,

    Thanks for the feedback,

    PLease find down under the TINA file associatedDiff_Int.TSC

  • 0 in reply to user5246204
    TI__Expert 7875 points
    Hi,

    I took a look at your circuit and it does look stable as Rohit mentioned. It looks like you should have about 70 degrees of phase margin, which should be more than enough.

    Regards,