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For the difference amplifier shown below, let all the resistors be 10kΩ ± x%. The expression for the worst-case common-mode gain is

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For the difference amplifier shown below, let all the resistors be 10kΩ ± x%. The expression for the worst-case common-mode gain is

(a) x / 50

(b) x / 100

(c) 2x / (100 – x)

(d) 2x / (100 + x)

I had been asked this question in exam.

My enquiry is from Difference Amplifiers in portion Operational Amplifiers of Electronic Devices & Circuits

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Correct option is (d) 2x / (100 + x)

The explanation is: None.

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