sallen key low pass filter

Discussion in 'The Projects Forum' started by Ainy shaikh, Apr 24, 2012.

  1. Ainy shaikh

    Thread Starter New Member

    Apr 20, 2012
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    whats the effect feed back resistor in sallen key low pass filter.....
     
  2. crutschow

    Expert

    Mar 14, 2008
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    It creates the second-order function that such a filter requires.
     
  3. mlog

    Member

    Feb 11, 2012
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    36
    Isn't the feedback resistor in the high-pass configuration?
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    You can have a feedback resistor in the non-unity gain configuration for the low pass case. In that case the feedback resistor forms part of a two resistor non-inverting gain configuration.
     
  5. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    My response was incorrect. :p t_n_k is correct. In the normal Sallen Key filter low-pass filter, the feedback resistor (if used) is just to determine the gain of the op amp.
     
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