1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Low pass filter operation

  1. Mar 8, 2012 #1
    1. The problem statement, all variables and given/known data

    We have a waveform with peak to peak amplitude 2V and a frequency of 600Hz. If this signal is to pass through a low-pass filter with a passband of 3.5kHz, explain why some distortion may occur to the waveform when shown on an oscilloscope.


    3. The attempt at a solution

    I thought there would be no distortion because the wave frequency is well below the passband of 3.5kHz.
    Can someone please give me some ideas as to why some distortion may occur. Or at least point me in the right direction.
    Thanks kindly for any help.
     
  2. jcsd
  3. Mar 8, 2012 #2

    gneill

    User Avatar

    Staff: Mentor

    What parameters are used to express sinusoid?
     
  4. Mar 8, 2012 #3
    amplitude, angular frequency and phase ?

    Sorry, I am pretty dense !
    I still dont see how some distortion would occur in the case I stated.

    Thanks for your persistence.
     
  5. Mar 8, 2012 #4

    gneill

    User Avatar

    Staff: Mentor

    Can you write the transfer function for a low pass filter with a suitable cutoff frequency?
    For a 600Hz input, what's the output amplitude and phase?
     
  6. Mar 9, 2012 #5

    NascentOxygen

    User Avatar

    Staff: Mentor

    Are you meant to interpret this to be a sinewave?
    You might need to expand your notion of "distortion" to be able to answer this question.
    What forms of "distortion" did you consider here?
     
  7. Mar 10, 2012 #6

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Hint: what is the shape of your voltage? Does it look like a sine wave, triangular, spiky, square .... ?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Low pass filter operation
  1. Active low pass filter (Replies: 4)

  2. Low Pass Filter (Replies: 5)

Loading...