Advanced Qualification · A-002 Advanced components and circuits · A-002-009-005
A frequency multiplier circuit must be operated in:
- A class C
- B class AB
- C class B
- D class A
Correct answer: A — class C. From the official ISED question bank, verified word for word.
Why
A frequency multiplier needs to create strong, sharp pulses of current to generate the higher harmonics required for the new frequency, and class C operation does this by conducting for less than half of the input cycle. 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.