Discussion
Why does an emitter bypass capacitor break at a much higher frequency than a coupling capacitor of the same value?
Answer: A
The resistance at the emitter is the degeneration resistor in parallel with the small intrinsic emitter resistance, often only tens of ohms, so the same capacitance gives a break hundreds of times higher. Its reactance at a given frequency is identical, being the same capacitance, and the parallel connection is why it sees that low resistance rather than being the reason directly. A time constant is a product, so a small resistance forces a large capacitance if a low break is wanted.
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