Advanced Qualification · A-002 Advanced components and circuits · A-002-007-001
What determines the input impedance of a FET common-source amplifier?
- A The input impedance is essentially determined by the gate biasing network
- B The input impedance is essentially determined by the resistance between the source and substrate
- C The input impedance is essentially determined by the resistance between the source and the drain
- D The input impedance is essentially determined by the resistance between the drain and substrate
Correct answer: A — The input impedance is essentially determined by the gate biasing network. From the official ISED question bank, verified word for word.
Why
A field-effect transistor, or FET, acts like a valve where the gate controls current flow without drawing much current itself. 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.