In the example with G1=60µV and G2=10µV, which is the output signal voltage?

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Multiple Choice

In the example with G1=60µV and G2=10µV, which is the output signal voltage?

Explanation:
A differential amplifier outputs a voltage proportional to the difference between its two input signals. With unit gain, the output equals Vplus minus Vminus. Here, the two inputs are 60 µV and 10 µV, so the difference is 60 − 10 = 50 µV. The output is positive 50 µV, since the first input is larger. If the gain were not 1, you’d multiply this difference by the gain, but with the given values the unity gain assumption yields 50 µV.

A differential amplifier outputs a voltage proportional to the difference between its two input signals. With unit gain, the output equals Vplus minus Vminus.

Here, the two inputs are 60 µV and 10 µV, so the difference is 60 − 10 = 50 µV. The output is positive 50 µV, since the first input is larger.

If the gain were not 1, you’d multiply this difference by the gain, but with the given values the unity gain assumption yields 50 µV.

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