Advanced Qualification · A-002 Advanced components and circuits · A-002-008-002
What would be the characteristics of the ideal op-amp?
- A Zero input impedance, infinite output impedance, infinite gain, and flat frequency response
- B Infinite input impedance, zero output impedance, infinite gain, and flat frequency response
- C Zero input impedance, zero output impedance, infinite gain, and flat
- D Infinite input impedance, infinite output impedance, infinite gain and flat frequency response
Correct answer: B — Infinite input impedance, zero output impedance, infinite gain, and flat frequency response. From the official ISED question bank, verified word for word.
Why
An ideal operational amplifier acts as a perfect voltage sensor that draws no current from the source, meaning it needs infinite input impedance, while also acting as a perfect voltage source that can drive any load without losing strength, requiring zero output impedance. 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.