Ham Radio General Class Practice Test

Which of the following is an analog integrated circuit?

1. NAND Gate

2. Microprocessor

3. Frequency Counter

4. Linear voltage regulator

The correct answer is: Linear voltage regulator

A linear voltage regulator is classified as an analog integrated circuit because it performs continuous (analog) processing of voltage signals to ensure a stable output voltage, despite fluctuations in input voltage and load conditions. Its primary function is to regulate voltage in a linear manner rather than switching rapidly between on and off states, which is characteristic of digital circuits. In contrast, a NAND gate serves as a digital logic gate designed for processing binary signals and is considered a digital integrated circuit. Microprocessors, while they can handle both digital and analog signals, are primarily digital devices dedicated to processing and executing commands. A frequency counter is a specialized digital device used to measure the frequency of external signals and operates within the digital domain as well. Therefore, the linear voltage regulator stands out as the correct choice, aligning with the defining characteristics of an analog integrated circuit by its operation and function.