What is the primary purpose of a sample-and-hold circuit in an ADC?

A) To amplify the signal

B) To convert the signal to digital

C) To maintain a constant voltage during the conversion process

D) To filter out noise

Answer: C) To maintain a constant voltage during the conversion process

Explanation: A sample-and-hold circuit captures the analog signal's voltage at a specific moment and holds it constant during the analog-to-digital conversion process, ensuring accurate digitization.