Bode plot / amplitude response

Thread Starter

Tobias Hildebrandt

Joined Jan 1, 2016
44
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
 

shteii01

Joined Feb 19, 2010
4,647
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?
 

Thread Starter

Tobias Hildebrandt

Joined Jan 1, 2016
44
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.
 
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