2nd order passive RC filter Transer Function

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Discussion in 'Homework Help' started by VVS, Dec 17, 2008.

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  1. Dec 17, 2008 #1
    VVS

    Thread Starter Active Member

    Jul 22, 2007
    66
    0
    Hi I need to derive the Transfer Function for the circuit i have attached. I am just not able to get there. I am almost there, but i think I have done something wrong and I just cannot find what is wrong.
    Can some1 pls show me the full working. I have done it with help of Thevenin Equivalents. But as i said cannot get the correct function.
    pls help me

    btw: tau1=R1*C1 tau2=R2*C2 tau12=R1*C2 and assume that R1=R3
     
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  2. Dec 17, 2008 #2
    hgmjr

    Retired Moderator

    Jan 28, 2005
    9,030
    218
    It would be good if you can post your solution. That way we can assist you in identifying where you took a wrong turn in your effort.

    hgmjr
     
    Last edited: Dec 17, 2008
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  3. Dec 18, 2008 #3
    hgmjr

    Retired Moderator

    Jan 28, 2005
    9,030
    218
    After working through the calculations, I was able to duplicate the answer contained in your attachment with one exception. The answer I arrived at does not contain the quantity -1 in the denominator. In my answer, the corresponding value is +1. In all other respects, the answer I have calculated matches the one given in the attachment term for term.

    I hope you will be able to post your work soon so that we can try to spot where you may be having a problem with your calculation.

    hgmjr
     
    #3 Reply
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