Advanced Qualification · A-002 Advanced components and circuits · A-002-008-009
What is an inverting op-amp circuit?
- A An operational amplifier circuit connected such that the input and output signals are 180 degrees out of phase
- B An operational amplifier circuit connected such that the input and output signals are in phase
- C An operational amplifier circuit connected such that the input and output signals are 90 degrees out of phase
- D An operational amplifier circuit connected such that the input impedance is held to zero, while the output impedance is high
Correct answer: A — An operational amplifier circuit connected such that the input and output signals are 180 degrees out of phase. From the official ISED question bank, verified word for word.
Why
An inverting op-amp circuit flips the signal, meaning when the input voltage goes up, the output goes down, creating a 180-degree phase shift. 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.