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OPA313: Stability Analysis of OPA313 circuit

Intellectual 1865 points

Replies: 2

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Part Number: OPA313

Hello,

I was wondering what the best way to test the stability of this circuit is since the feedback involves a FET? Would it be best to use the standard method talked about in precision labs or the transient overshoot method? How would that setup look in TINA? Thanks!

Best,

Adam Daluga

  

  • Adam,

    In the real physical world, transients are used because they are easy to implement.
    In simulation where everything is easy, break the loop (R1 to IN-) and do a bode plot.

    Regards,
    Ronald Michallick
    Linear Applications

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  • In reply to Ron Michallick:

    Hi Adam,

    I just wanted to attach an example of how to break this loop and do the stability analysis. This circuit has stability issues and low phase margin so I would recommend that you do some reading online regarding the common methods for stabilizing this circuit.

    Best,

    Paul

    OPA313_StabilitywFET.TSC

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