Discussion
A pair's collector loads are \( 20 \ \mathrm{k\Omega} \) with a tail current of \( 200 \ \mathrm{\mu A} \). Its single-ended gain is about
Answer: D
Each device carries a hundred microamps:
\[ \begin{aligned} g_{m} &= \tfrac{100\mathrm{\mu}}{26\mathrm{m}} \approx 3.85 \ \mathrm{mS} \\ A_{v} &\approx \tfrac{3.85\mathrm{m} \times 2\times10^{4}}{1} \approx 77 \end{aligned} \]
Taking the single-ended halving into account gives about 77. Halving the tail current before computing the transconductance is the step that matters, and forgetting it doubles the answer.
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