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In a control system, the bandwidth of a system roughly measures:

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  1. Phase crossover frequency
  2. Undamped natural frequency
  3. Resonant frequency
  4. Gain crossover frequency

Answer (Detailed Solution Below)

Option 4 : Gain crossover frequency
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Bandwidth (BW) is defined as the frequency at which the magnitude of the closed loop system is equal to 0.707.

The bandwidth indicates the frequency range for which satisfactory operation occurs.

It roughly measures the gain crossover frequency

Gain crossover frequency (ωgc) is the frequency at which the gain magnitude of the closed loop system is equal to one.

Phase crossover frequency (ωgc) is the frequency at which the phase of the closed loop system is equal to ±180°.

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