Advanced Qualification · A-002 Advanced components and circuits · A-002-007-007
In the common collector amplifier, when the input and output signals are compared:
- A the signals are 180 degrees out of phase
- B the signals are in phase
- C the output signal leads the input signal by 90 degrees
- D the output signal lags the input signal by 90 degrees
Correct answer: B — the signals are in phase. From the official ISED question bank, verified word for word.
Why
In a common collector amplifier, the output voltage at the emitter follows the input voltage at the base almost exactly, meaning they rise and fall together without flipping. 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.