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Control System::Bode Plot

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         To draw a bode plot , follow these simple steps:

Magnitude Plot:
  1. Put the frequency response equation into bode equation form.
  2. identify the DC gain value, and mark this as a horizontal line coming in from the far left (where the radial frequency conceptually is zero).
  3. At every "zero" break point, increase the slope of the line upwards by 20db/decade.
  4. At every "pole" break point, decrease the slope of the line downwards by 20db/decade.
  5. at every breakpoint, note that the "actual value" is 3db off from the value graphed.

Phase Plot


  1. If A is positive, start your graph (with zero slope) at 0 degrees. If A is negative, start your graph with zero slope at 180 degrees (or -180 degrees, they are the same thing).
  2. For every zero, slope the line up at 45 degrees per decade when  \omega = \frac{z_n}{10}  (1 decade before the break frequency). Multiple zeros means the slope is steeper.
  3. For every pole, slope the line down at 45 degrees per decade when  \omega = \frac{p_m}{10}  (1 decade before the break frequency). Multiple poles means the slope is steeper.
  4. Flatten the slope again when the phase has changed by 90 degrees (for a zero) or -90 degrees (for a pole) (or larger values, for multiple poles or multiple zeros.







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