High pass filters

Discussion in 'Homework Help' started by skanes 1, Apr 8, 2009.

  1. skanes 1

    Thread Starter New Member

    Mar 2, 2009
    1
    0
    I need to find out the formula for the Vout of a high pass filter
    Can any one help me out ?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The magnitude of the voltage out will have to do with that of the voltage in and frequency.
     
  3. efox

    Member

    Aug 8, 2006
    11
    0
  4. scythe

    Active Member

    Mar 23, 2009
    49
    5
    A high pass filter is simply running your output in series with a capacitor. The reason for this is that the impedance ("resistance") for a capacitor is:

    (jωC)^-1

    Remember that ω = 2∏f. Therefore, the impedance of a capacitor goes extremely low as the frequency goes extremely high, thereby allowing high frequencies to pass through OK. If you have a low frequency, your impedance will be come extremely high, thereby "cutting off" your output.
     
Loading...