Bode plot / amplitude response

Discussion in 'Homework Help' started by Tobias Hildebrandt, Jan 19, 2016.

  1. Tobias Hildebrandt

    Thread Starter Member

    Jan 1, 2016
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    0
    Capture36.PNG

    Hello,

    here we are supposed to plot the amplitude and phase response of the circuit above.

    The phase response was easy enough, but I cant find the right formula for the amplitude response. I thought it was 20 * lg (1/sqrt(1 + (wCR)^2)), but that didnt get me anywhere. Is there a simple formula to plot the amplitude response?

    Tobias
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,392
    497
    First.
    Your graph paper is in Hz. Your formula is in rad/s. w=2*pi*f
    Therefore:
    f=w/(2*pi)
    So.
    Did you use frequency in Hz or in rad/s to do your calculations for amplitude in dB?
     
  3. Tobias Hildebrandt

    Thread Starter Member

    Jan 1, 2016
    44
    0
    Capture37.PNG
    I don't know what just happened, very likely I made a mistake on my calculator, because now I got the correct results. Bizarre, I worked on this for ages.... Oh well.
    So the formula works after all.
    Thanks anyway.
     
  4. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,392
    497
    Sleep deprivation will do that.
     
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