Bode Diagrams o a Bode diagram is a graphical method for illustrating how the phase angle and amplitude ratio of a particular system vary with frequency of the input sinusoid. For example consider the integrating system: G(s)=, the amplitude ratio and phase angle were determined above to be: AR= 90 The table below shows how these values vary with frequency AR 201og(ar) o 0.01 40dB 9 0.1 20dB 90° 1.0 OdB 90 0.1 -20dB 90° 100 0.01 40dB 2022-2-3 72022-2-3 7 Bode Diagrams ¨ A Bode diagram is a graphical method for illustrating how the phase angle and amplitude ratio of a particular system vary with frequency of the input sinusoid. For example consider the integrating system: , the amplitude ratio and phase angle were determined above to be: . The table below shows how these values vary with frequency: G s s ( )  1 AR    1 90 0 w ,  AR 20log(AR) 0.01 100 40dB 0.1 10 20dB 1.0 1 0dB 10 0.1 -20dB 100 0.01 -40dB w 90  90  90  90  90