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Analog Electronics Operational 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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