In a Sample and Hold circuit  a. one input is analog, another input is digital, output is a pulse with varying amplitude b. both input is digital, output is a pulse with varying amplitude c. both inputs are analog and output is a pulse with varying amplitude d. both inputs are analog and output is analog with varying amplitude

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Sample and Hold circuit

The sampling circuit and the holding circuit generate electrical samples as input and then hold these samples for a specified period. The time at which the sample and circuit holder produces the input signal sample is called the sampling time. Correspondingly, the length of the circuit that holds the sampled value is called the holding time.