calculating the resistors, capacitor values for pole zero low pass filter

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Discussion in 'General Electronics Chat' started by dumindu89, Jul 18, 2012.

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  1. Jul 18, 2012 #1
    dumindu89

    Thread Starter Member

    Oct 28, 2010
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    I need to calculate the resistors and capacitor values for a pole zero (low pass) filter. The cut off frequency is 70 kHz.

    Please help me do the calculations.
     
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  2. Jul 18, 2012 #2
    nomurphy

    AAC Fanatic!

    Aug 8, 2005
    567
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    F = 1 / 2pi*R*C, therefore R = 1 / 2pi*F*C, or C = 1 / 2pi*R*F

    In the reasonable value range, one answer out of many is 22.6K and 100pF.
     
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  3. Jul 18, 2012 #3
    crutschow

    Expert

    Mar 14, 2008
    18,639
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    That, of course, is for a single-pole filter which has the low rolloff rate of 6dB/octave.
     
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  4. Jul 18, 2012 #4
    dumindu89

    Thread Starter Member

    Oct 28, 2010
    113
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    I am asking the calculations for a pole zero filter as shown in the following figure. There are two resistors instead of one. Then what would be the case in calculating the values?

    [​IMG]
     
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  5. Jul 18, 2012 #5
    Jony130

    AAC Fanatic!

    Feb 17, 2009
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    All you need to do is to find the transfer function
    [​IMG]
     
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