Understanding magnitude and phase Bode plots.

Discussion in 'Electronics Homework Help' started by paris, Sep 15, 2012.

1. paris

2
0
Sep 15, 2012
I'm having problems understanding Bode plots. I've been studying from this website:

http://lpsa.swarthmore.edu/Bode/BodeExamples.html

And I understood the concept of poles, zeros, increasing at 20dB/decade, transfer functions, etc etc.. What I don't understand (taken Example 3) is how to draw the final construction of the these bode plots.. In the case of the magnitude plot of what I understood, isn't the final plot supposed to begin at 30dB, decrease to 20dB, decrease again to 0dB at real pole at -3 and increase at real zero at -10? However, I don't get why does the exact plot begins before 40dB and continues to decrease past the real pole at -3..

The same goes for the phase plot. I understood how to construct the plots according to each pole and zero, but I don't understand how to get to the final plot at the end. I hope I make some sense and I hope someone could help me clear some of my doubts.

Thank you in advance! 2. paris

2
0
Sep 15, 2012
TYPO:

*continues to decrease past the real zero at -10..  