Optimum Feedback Amplifier Design For Control Systems
Many designers think of control system feedback loop compensation only in
terms of stable or unstable. In reality, there is an optimum error amplifier
transfer function for any given loop crossover frequency and phase margin.
The optimum design is shown to be the one with the highest gain below
crossover and the lowest gain above crossover. There is a unique pole-zero
placement to achieve optimum performance. This pole-zero placement and
resultant circuit component values can be determined without
trail-and-error. In addition, there is an optimum open loop crossover
frequency (loop bandwidth) or any given phase margin.
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