Bode Diagram Rules

# Bode Diagram Rules - Constant: K 20log[abs(k)] k>0 0...

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20log[abs(k)] k>0 0 degrees k<0 -180 degrees Pole at Origin (Integrator) -20 dB/decade passing through 0 dB at w=1 -90 degrees Zero at Origin (Differentiator) +20 dB/decade passing through 0 dB at w=1 +90 degrees Real Pole Draw low frequency asymptote at 0 dB Draw high frequency asymptote at -20 dB/decade Connect lines at break frequency. Draw low frequency asymptote at 0 degrees Draw high frequency asymptote at -90 degrees Connect with a straight line from 0.1 w0 to 10 w0 Real Zero Draw low frequency asymptote at 0 dB Draw high frequency asymptote at +20 dB/decade Connect lines at break frequency. Draw low frequency asymptote at 0 degrees Draw high frequency asymptote at +90 degrees Connect with a straight line from 0.1 w0 to 10 w0 Underdamped Poles (Complex conjugate poles) Draw low frequency asymptote at 0 dB Draw high frequency asymptote at -40 dB/decade Draw peak at the frequency w=w(o)*sqr[1-2*(damp)^2] Draw amplitude h=-20log[2*damp*sqr[1-damp^2] Note: the peak frequency is typically very near the break frequency. Connect lines

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## This note was uploaded on 01/23/2012 for the course EE 4580 taught by Professor Gu during the Fall '10 term at LSU.

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Bode Diagram Rules - Constant: K 20log[abs(k)] k>0 0...

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