Discussion
With a differential gain of \( 100 \), that pair's rejection ratio is about
Answer: B
Taking the ratio of the two gains and converting:
\[ \begin{aligned} \text{CMRR} &= \tfrac{100}{0.005} = 20000 \\ &= 20\log_{10} 20000 \approx 86 \ \mathrm{dB} \end{aligned} \]
giving about 86 dB, respectable for a discrete pair though well short of what an integrated design with a good current source achieves. Quoting the ratio in decibels rather than as twenty thousand makes it comparable with other specifications.
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