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TINA/Spice/TLE2037: Active High Pass RC Filter

Gareth Shelley
Prodigy 60 points
Part Number: TLE2037
Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

Hi guys,

I have designed an active high pass filter, which when using an ideal op amp gives a perfect response (as expected), however when using a real op amp I am getting some sort of a spike at the higher end of the scale. Does anyone know what is likely causing this, and if so, how I can rectify the issue? I have attached some images and the .TSC file, just in case.

Thanks in advance,

Gareth

High Pass Filter Real Amp.TSC

  • 0
    TI__Mastermind 40295 points

    Gareth,

    The peak indicates a high frequency instability. You can see this with a transient pulse response below.
    It shows the expected behavior for a high-pass filter, but there is extra high frequency ringing after each transition.
    The most likely cause of the instability is the op amp's parasitic capacitance and/or open-loop response interacting with the filter components.

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/234/tinadiag.emf

    Regards,
    John

  • 0 in reply to John Miller - Sensing
    Prodigy 60 points

    Hi John,

    Thank you very much for your reply, and I'm glad that it is not just something that I have done wrong!

    Thanks again,

    Gareth