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Analog Electronics Noise in Analog Circuits

If the measurement bandwidth for white voltage noise is increased by a factor of 4, the RMS noise voltage increases approximately by a factor of?

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Correct Answer: A. 2

Explanation: Mean-square white noise is proportional to bandwidth, so RMS noise is proportional to sqrt(B). Increasing B fourfold doubles RMS noise.

Reference: Standard analog electronics: noise bandwidth numerical

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