Discussion
What sets the low-frequency limit of a clamper?
Answer: B
The time constant of the capacitor and its discharge path must be long compared with the signal period, or the clamped level sags within each cycle and the waveform tilts. Recovery time matters at high frequencies rather than low ones, the voltage rating is a protection matter, and the reference impedance is usually negligible. A storage element's time constant against the signal period is the standard question to ask of any circuit that holds a value between events.
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