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THS4524: THS4524

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

  • 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,

    Jacob Freet 
    High Speed Amplifiers

  • In reply to Jacob%20Freet:

    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

  • In reply to Rohit Bhat:

    Hello,

    Thanks for the feedback,

    PLease find down under the TINA file associatedDiff_Int.TSC

  • In reply to user5246204:

    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,

    Jacob Freet 
    High Speed Amplifiers

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