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2 high-pass filters with different R and C values, discuss the differences

  1. Apr 9, 2012 #1
    You have two high-pass filters with different R and C values discuss the difference in the response.

    Filter a) R=5kΩ C=250μf
    Filter b) R=25kΩ C=50μf

    I calculated that they have the same cut-off frequency but without actually testing the circuit on Multisim and connecting a bode plotter I don't know how to find any differences
     
  2. jcsd
  3. Apr 9, 2012 #2
    Just speculating here, but if the cut-off frequency were the same, shouldn't the response here be the same?

    If not, then I assume any differences in response would be due to a transient response due to the different capacitances. Just speculation though.
     
  4. Apr 9, 2012 #3
    That's what I thought but the cut off frequency is proportional to 1/RC and the RC value for both circuits is the same. It could be transient response but I don't know much about it because we haven't been taught anything about it
     
  5. Apr 10, 2012 #4

    NascentOxygen

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    Staff: Mentor

    Sketch each filter as a 2 port network, and label input and output.

    ➤ Consider input impedance.
     
  6. Apr 10, 2012 #5

    NascentOxygen

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    Staff: Mentor

    Your subject say "discuss the differences", your post says "discuss the difference in the response".

    What is the exact wording of the question?
     
  7. Apr 10, 2012 #6
    The question says discuss the differences in the response. It's alright now, the lecturer sent us an answer sheet and the answer was there is no differences, they are identical. I hate it when they do that.
     
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