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Interfacing to the Analog World

Q1: What is the purpose of a sample-and-hold circuit?

A To keep temporary memory

B To hold a voltage constant so an ADC has time to produce an output

C To hold a voltage constant so a DAC has time to produce an output

D To hold data after a multiplexer has selected an output

ANS:B - To hold a voltage constant so an ADC has time to produce an output

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