Question: What is the function of a sample-and-hold circuit in an ADC?

Options:

1. To amplify the input signal
2. To convert the signal to digital
3. To maintain a constant voltage level during conversion
4. To filter out noise

Correct Answer: To maintain a constant voltage level during conversion

Solution:

A sample-and-hold circuit captures and holds the input voltage constant during the analog-to-digital conversion process.