MCQ Practice Question

A sample-and-hold circuit placed ahead of an ADC is primarily used to?

AKeep the analog input approximately constant during conversion
BGenerate the ADC clock
CStore the final digital code permanently
DIncrease the number of ADC bits automatically

Correct Answer: A. Keep the analog input approximately constant during conversion

Explanation: The sample-and-hold captures the instantaneous analog input and holds it nearly constant so the ADC sees a stable value while conversion is in progress.

Reference: Standard digital electronics: sample-and-hold