Bode Plots & High Pass, Low Pass, Band Stop and Pass Frequencies

Discussion in 'Homework Help' started by libnitz, Feb 20, 2016.

  1. libnitz

    Thread Starter New Member

    Jan 29, 2016
    17
    0
    Hi,

    I just need some confirmation on 3 questions

    upload_2016-2-20_20-21-53.png

    1. I was asked to calculate the poles and zeros. I believe

    zeros: none
    poles: 2 (or p1,2) = -1

    2. I was also asked to calculate the slope of the magnitude response was w -> 0
    Here is my sketched graph
    2016-02-20 20.17.13.jpg

    From my pic, it shows that as w -> 0, H(s) -> 0.


    3. What type of filter response does this network exhibit.
    I believe it will be a Low Pass because as

    s->0, H(s) -> 1 and as s-> infinity, H(s) -> 0?

    Does this reasoning make it a low pass filter, high pass, band stop or band pass?

    Any help is appreciated
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,395
    497
    3.
    Yes.
    As w increases, s=jw will also increase. s is in the denominator so as s increases, the denominator also increases, so as s becomes bigger, \frac{1}{s^2} will become smaller and smaller and smaller. So near 0 rad/s (or Hz) you will have some useful response, but as you move further away (toward infinity), the response will sharply drop.
     
    libnitz likes this.
  3. libnitz

    Thread Starter New Member

    Jan 29, 2016
    17
    0
    Thanks! I used the same reasoning as you wrote, however I was not too sure I got it right.

    Could you also double check my calculations on this problem also?

    MOD NOTE: You already have an active thread on this other problem.

    http://forum.allaboutcircuits.com/t...-need-help-double-checking-my-answers.121138/

    Please -- one thread per problem (and, ideally, one problem per thread).
     
    Last edited by a moderator: Feb 21, 2016
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