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

Reply to Thread

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

Reply to Thread
  1. Jul 18, 2012 #1
    dumindu89

    Thread Starter Member

    Oct 28, 2010
    113
    0
    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.
     
    #1 Reply
  2. Jul 18, 2012 #2
    nomurphy

    AAC Fanatic!

    Aug 8, 2005
    567
    13
    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.
     
    #2 Reply
  3. Jul 18, 2012 #3
    crutschow

    Expert

    Mar 14, 2008
    19,743
    5,523
    That, of course, is for a single-pole filter which has the low rolloff rate of 6dB/octave.
     
    #3 Reply
  4. Jul 18, 2012 #4
    dumindu89

    Thread Starter Member

    Oct 28, 2010
    113
    0
    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]
     
    #4 Reply
  5. Jul 18, 2012 #5
    Jony130

    AAC Fanatic!

    Feb 17, 2009
    4,478
    1,264
    All you need to do is to find the transfer function
    [​IMG]
     
    #5 Reply
    dumindu89 likes this.
Loading...
Related Forum Posts:
  1. DamarJati

    Resistor and Capacitor value for Low-Pass Filter

    Posted by DamarJati in forum: Homework Help
    Replies:
    6
    Views:
    295
  2. mdylanmst20

    Low pass filter RC values for varying PWM duty cycle

    Posted by mdylanmst20 in forum: General Electronics Chat
    Replies:
    12
    Views:
    742
  3. kannan26nov88

    How to select the capacitor and resistor value for Active low pass filter

    Posted by kannan26nov88 in forum: General Electronics Chat
    Replies:
    4
    Views:
    2,171
  4. siliconviet

    Calculate value of a capacitor for low pass filter?

    Posted by siliconviet in forum: General Electronics Chat
    Replies:
    3
    Views:
    3,749
  5. anik321

    pole of a low-pass filter

    Posted by anik321 in forum: General Electronics Chat
    Replies:
    5
    Views:
    2,315
You May Also Like:

  1. Calculating the Lifespan of Electrolytic Capacitors with De-Rating

  2. Teardown Tuesday: IR Thermometer

  3. Three Reasons You Should Be Applying to Y Combinator


Load More Articles