Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-001-011
In an oscillator where positive feedback is provided through a capacitor in series with a crystal, that type of oscillator is a:
- A Pierce
- B Colpitts
- C Hartley
- D Franklin
Correct answer: A — Pierce. From the official ISED question bank, verified word for word.
Why
A Pierce oscillator uses a crystal as the frequency-determining element with positive feedback routed through a capacitor in series, which stabilizes the signal at the crystal's precise frequency. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.