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Analog ElectronicsOperational Amplifiers

An op-amp has a unity-gain frequency of 10 MHz and is used at a noise gain of 20. Under a single-dominant-pole approximation, the closed-loop bandwidth is approximately?

  • A50 kHz
  • B500 kHz
  • C2 MHz
  • D20 MHz
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Correct Answer: B. 500 kHz
Explanation: Closed-loop bandwidth is approximately unity-gain frequency divided by noise gain: 10 MHz/20=500 kHz.
Reference: Standard analog electronics: gain-bandwidth numerical
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