Discussion
A pair's measurements are as follows.
| Parameter | Value |
|---|---|
| Differential gain | 500 |
| Common-mode gain | 0.01 |
| Offset voltage | 2 mV |
What is its rejection ratio?
Answer: D
Taking the ratio of the two gains and converting to decibels:
\[ \begin{aligned} \text{CMRR} &= \tfrac{500}{0.01} = 50000 \\ &= 20\log_{10}50000 \approx 94 \ \mathrm{dB} \end{aligned} \]
giving about 94 dB. The offset voltage is a distractor here, since it plays no part in the rejection calculation. Spotting which of a table's figures the question does not need is half the work in a question of this shape.
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