Discussion
A pair with \( 5 \ \mathrm{k\Omega} \) collector loads has a tail impedance of \( 500 \ \mathrm{k\Omega} \). Its common-mode gain is about
Answer: A
Common-mode gain is roughly the collector load over twice the tail impedance:
\[ A_{cm} \approx \frac{5000}{10^{6}} = 0.005 \]
giving about 0.005, so the stage attenuates a shared signal two hundredfold while amplifying a difference. The factor of two in the denominator comes from the two devices sharing the tail, and omitting it doubles the answer.
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