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Thread: Impedance of Band Pass Filter

  1. #1 Impedance of Band Pass Filter 
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    (1) How do I calculate the impedance using the transfer function of the Inverting Band Pass Filter shown in the link below?

    http://www.electronics-tutorials.ws/filter/fil51.gif

    The Transfer Function is H(jw)=jwR2C1/[(jwR2C2)(jwR1C1)]

    (2) How is this transfer function derived/obtained?

    Transfer function of low pass filter: - (R2/R1) * (1/[jwR2C+1])
    Transfer function of high pass filter: - (jwR2C)/(jwR1C+1)

    So if I multiply these together it seems I get the transfer function of the band pass filter H(jw) multiplied by R2/R1.
    So how does the R2/R1 just disapear from the transfer function?


    Last edited by Mechatron; February 14th, 2014 at 08:16 PM.
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