Low frequency magnitude

Discussion in 'Homework Help' started by nyasha, Feb 6, 2011.

  1. nyasha

    Thread Starter Active Member

    Mar 23, 2009
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    What is the low frequency magnitude of a filter ? There is a question in my textbook asking me to find this but l don't know what is it. Can someone please explain to me
     
  2. Georacer

    Moderator

    Nov 25, 2009
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    Maybe it refers to the filter's gain on very low frequencies, where you can simulate the filter's capacitors with open-circuits. Also known as DC gain.
     
  3. mik3

    Senior Member

    Feb 4, 2008
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    And the inductors, if any, as short-circuits.
     
  4. Georacer

    Moderator

    Nov 25, 2009
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    Of course, those too. Even though they are more rare in a common filter circuit.
     
  5. Papabravo

    Expert

    Feb 24, 2006
    10,163
    1,796
    When it comes to filters "magnitude" refers to the gain(loss) with respect to some reference point. That reference point is usually the input, and the output level is compared to the input as a function of frequency.
     
  6. nyasha

    Thread Starter Active Member

    Mar 23, 2009
    90
    1
    Thank you very much. Low frequency magnitude is DC gain apparently.
     
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