In electronics, a clamped capacitor is a capacitor where the lowest peak in the output waveform is clamped (i.e., limited) to a certain voltage, achievable due to diode properties. Such a circuit is called a bootstrapping circuit.
Take this example:1
Note that when the capacitor is charged up, the diode will be off. At the lowest points of the waveform, the diode is on.
Footnotes
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From Sedra/Smith pp 223. ↩