Discussion
Why must an emitter bypass capacitor be much larger than a coupling capacitor?
Answer: A
The resistance at the emitter is tens of ohms against a coupling capacitor's tens of kilohms, so the same cut-off frequency demands a capacitance perhaps a thousand times larger. It passes only the signal current, not the quiescent current, and the charge and voltage arguments do not apply. A time constant is a product, so a small resistance always forces a large capacitance if the frequency is to be reached. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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