Discussion
What happens between a stage's bypass break frequency and its coupling break frequency?
Answer: B
Below the bypass break the capacitor no longer shorts the emitter resistor, so the gain settles at the degenerated ratio and stays there until the coupling capacitor starts to act. It is a step in the response rather than a continuous fall. That an amplifier can have a shelf in its low-frequency response, rather than a simple roll-off, surprises people who expect one slope, and it follows directly from the two break points being far apart. Framing the question as which quantity the change acts upon makes the answer follow without calculation. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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