Discussion
A stage's gain falls markedly when the emitter bypass capacitor is removed. Why?
Answer: A
Without the bypass, the emitter resistor appears in the signal path and the gain becomes the ratio of collector to emitter resistance rather than the much larger ratio to the intrinsic 26 ohms. The operating point is unchanged, since the direct conditions do not involve the capacitor, and the input impedance rises rather than falls. A component that is present for direct current and absent for signals is doing two jobs, and removing it reveals which one was being taken for granted.
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