How to select the capacitor and resistor value for Active low pass filter

Discussion in 'General Electronics Chat' started by kannan26nov88, Jun 16, 2014.

  1. kannan26nov88

    Thread Starter New Member

    Feb 9, 2014
    1
    0
    Is there any rule to select the capacitor and resistor for active filters?
    Pls. suggest.
     
  2. wmodavis

    Well-Known Member

    Oct 23, 2010
    737
    150
    Yes. Pick them so that the calculated roll off frequency is appropriate to the requirement of the design.
     
  3. atferrari

    AAC Fanatic!

    Jan 6, 2004
    2,644
    759
    For any practical design I suggest you to download this software.

    I used it many times with good results.
     
  4. crutschow

    Expert

    Mar 14, 2008
    12,974
    3,220
    There's also FilterPro software from Texas Instruments.
     
  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,515
    1,246
    There is no single "standard" active filter circuit. Without getting into how many poles the filter is, there are

    functions: high pass, low pass, bandpass, notch...
    basic topologies: Butterworth, Cauer, Chebyshev (lotsa spellings for that one), Bessel...
    implementations: Sallen-Key, state-variable, bi-quadratic, gryators...

    and on and on. Wiki has a good starting page, but it goes on and on, and it does assume that you can handle some math. This is a large topic in EE.

    http://en.wikipedia.org/wiki/Active_filter

    ak
     
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