Pspice Cutoff Frequency

Discussion in 'Homework Help' started by MarsG, Nov 1, 2015.

  1. MarsG

    Thread Starter New Member

    Sep 12, 2015
    24
    1
    Im trying to get the cut-off frequency at the capacitor of this EKG assignment we are completing for class, I completed the by hand solutions but im not sure on how to get frequency response simulation in pspice, I tried the trace ----> Measurements but I keep getting an error.
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,392
    497
    It is ac analysis.

    .AC LIN NP FSTART FSTOP
    .PROBE
     
  3. MarsG

    Thread Starter New Member

    Sep 12, 2015
    24
    1
    ekggraph.png
    I think i got it but the frequency seems to be off from my calculated, im getting a cutoff at around 100Hz but my calculated was 15.92hz, my voltage gain seems to be right
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    You circuit shows positive feedback. It needs to be negative.
     
  5. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,392
    497
    I am getting cutoff at 52 kHz.
    Max amplitude of -61.284 dB, -61.284 dB-3 dB=-64.284 dB this is where we look for cutoff frequency. At -64.32 dB I get 52.784 kHz.
     
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