Bode plot rules

1. What are the rules of Bode plots?
2. What are zeros in Bode plot?
3. How do you find the zeros and poles of a Bode plot?

What are the rules of Bode plots?

The rule of thumb for making the Bode Magnitude Plot is: For every pole, the slope of the magnitude decreases by 1. For every zero, the slope of the magnitude increases by 1. A slope of 1 is equal to 20 dB/decade or 8dB/octave.

What are zeros in Bode plot?

Key Concept: Bode Plot of Real Zero:

The plots for a real zero are like those for the real pole but mirrored about 0dB or 0°. For a simple real zero the piecewise linear asymptotic Bode plot for magnitude is at 0 dB until the break frequency and then rises at +20 dB per decade (i.e., the slope is +20 dB/decade).

How do you find the zeros and poles of a Bode plot?

For multiple order poles and zeros, simply multiply the slope of the magnitude plot by the order of the pole (or zero) and multiply the high and low frequency asymptotes of the phase by the order of the system.