Discussion
An emitter resistor of \( 100 \ \Omega \) is now added without bypassing. The gain becomes about
Answer: B
The emitter resistance adds to the intrinsic 26 ohms:
\[ A_{v} \approx -\frac{5000}{100+26} \approx -40 \]
so about -40, five times less than before. What has been bought is predictability: the gain now depends on two resistors rather than on the operating current, so it barely moves with temperature or device spread. Trading gain for stability through local feedback is the single most common move in analogue design.
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