Passive/Active Frequency Response

  1. I'm evaluating the Frequency Response and subsequently Step Response of a bandpass filter.
    Is the frequency response going to be different for an active bandpass filter from a passive bandpass filter?

    I've plotted the frequency response using LTspice with the following setup:

    Small signal AC analysis:
    AC amplitude: 15 V

    Simulation Command:
    Type of sweep: Octave
    Number of points per octave: 30
    Start frequency: 1
    Stop frequency: 300

    My hand calculations suggest the max frequency should be about 40 kHz.
    However, using the -3dB rule, the max frequency ends up on 100 kHz.

    Any suggestions?
  2. jcsd
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