Finding frequency response of unideal op-amp

Discussion in 'Homework Help' started by xortan, Dec 16, 2012.

  1. xortan

    Thread Starter New Member

    Apr 27, 2010

    I am designing a low-pass filter using a op-amp and has a cut-off frequency at 1.5 KHz. I can't assume it is ideal and when looking at the manufacturers datasheet they provided a bode-plot of the open-loop gain frequency response.

    I am wondering how I can use the bode-plot in the datasheet to determine the frequency response of the op-amp?

    I have tried modelling it using feedback control with this equation:

    T(s) = G(s) / (1 + G(s)H(s))

    The problem with this is I keep getting back the same numbers as the ideal response and I am not to sure how to do the phase.

    Thank you!
  2. #12


    Nov 30, 2010
    Determine the gain you want and read the bode plot to see what the frequency is when the limit line crosses the gain level.

    (I don't know how to do the phase, either.)