Advanced Qualification · A-002 Advanced components and circuits · A-002-008-001
What is an operational amplifier (op-amp)?
- A An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
- B A program subroutine that calculates gain of an RF amplifier
- C A high-gain, direct-coupled differential amplifier whose characteristics are determined by components mounted
- D A high-gain, direct-coupled audio amplifier whose characteristics are determined by internal components of device
Correct answer: C — A high-gain, direct-coupled differential amplifier whose characteristics are determined by components mounted. From the official ISED question bank, verified word for word.
Why
An operational amplifier is a high-gain, direct-coupled differential amplifier, meaning it boosts the difference between two input signals without needing capacitors to block direct current. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.