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Design of High Pass filter

Discussion in 'General Electronics Discussion' started by abdulwali, Jul 26, 2017.

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  1. abdulwali

    abdulwali

    3
    0
    Mar 30, 2016
    HI,
    i have a first order controller (ts/ks+k) which contain some oscillations and its settling time is very huge, i wanted the controller to have settling time of 10seconds and remove the oscillations. in order to remove the noise and get the expected settling time i added a filter ( s/cs+1) where c=1/fc where fc=cutoff frequency to the transfer function. during troubleshooting after choosing different values for fc finally i chose fc=100 and it gave me settling time of 10seconds. Now i am not sure and i want to know that how to prove this mathematically ?? or how it happened??or how it happened??Or is it possible to prove it from bodeplot as attached to the link below?
    https://drive.google.com/open?id=0B9NQhKDld_D4TjNPNzNoM2I3U28

    Your help is appreciated. Thanks in advance.
     
    Last edited: Jul 26, 2017
  2. Audioguru

    Audioguru

    2,906
    649
    Sep 24, 2016
    It is a lowpass filter that passes DC and low frequencies and cuts high frequencies. Its -3dB frequency is extremely low. A second order filter will work twice as good and a quad or more order active filter will work much better.
     
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