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Elliptic (Cauer) Low pass filter design

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Discussion in 'Electronics Homework Help' started by tblues87, Apr 21, 2013.

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  1. Apr 21, 2013 #1
    tblues87

    tblues87

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    Apr 21, 2013
    Hi
    can someone suggest which design to use for active low pass filter 4th order. I have tried Tow - Thomas filter (Biquad filter) with 4 op amps 2nd order in cascade, but the ripple in pass band doesn't do to the -1dB and also one peak goes over 0 dB.
    I'm asking because with transfer function, from which I calculated elements, in Matlab I got perfect results with Bode.

    Thank you
     

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  2. Apr 22, 2013 #2
    Laplace

    Laplace

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    Apr 4, 2010
    Are you saying that in theory the filter performance was perfect but in practice the filter you built and tested did not perform as well? What method did you use to tune the filter?
     
  3. Apr 22, 2013 #3
    tblues87

    tblues87

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    Apr 21, 2013
    I compared transfer function from matlab with transfer function of the circuit, for each section.
     
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