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!

Simple High Pass Filter Problem

  1. Feb 25, 2008 #1
    1. The problem statement, all variables and given/known data

    Given a simple RC high pass filter, I need to find the value of C that will give the output as shown on a scope capture.

    Input Voltage: [tex]2.5 + 10.01cos(\omega t)[/tex] (10.01V wave shifted up 2.5V)
    Output Voltage: [tex]3.46cos(\omega t - 60^\circ)[/tex]
    R = 5k
    [tex]\omega = 2\pi 100[/tex]

    2. Relevant equations

    [tex] V_O = \frac {V_I}{1 + \frac {1}{j\omega RC}}[/tex]

    3. The attempt at a solution

    I'm not sure how to take into account the DC component of the input voltage. I know it will be filtered out in the end, but I would think that it would be needed for the computations. Ignoring the DC component and using phasor notation, I come up with a phase angle of -19.9 equal to a phase angle of -30:

    [tex]3.46\angle60 + \frac {3.46}{(628.32)(5k)C}\angle-30 = 10.01\angle0[/tex]

    [tex]\frac {3.46}{(628.32)(5k)C}\angle-30 = 8.81\angle-19.9[/tex]

    Where'd I go wrong?
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you help with the solution or looking for help too?



Similar Discussions: Simple High Pass Filter Problem
  1. NP problems (Replies: 0)

Loading...