Advanced Qualification · A-002 Advanced components and circuits · A-002-007-002
What determines the output impedance of a FET common-source amplifier?
- A The output impedance is essentially determined by the gate supply voltage
- B The output impedance is essentially determined by the input impedance of FET
- C The output impedance is essentially determined by the drain resistor
- D The output impedance is essentially determined by the drain supply voltage
Correct answer: C — The output impedance is essentially determined by the drain resistor. From the official ISED question bank, verified word for word.
Why
In a common-source amplifier, the signal leaves through the drain, where the drain resistor sits between the power source and the transistor. 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.