Advanced Qualification · A-002 Advanced components and circuits · A-002-009-008
In a frequency multiplier circuit, an inductance (L1) and a variable capacitor (C2) are connected in series between VCC+ and ground. The collector of a transistor is connected to a tap on L1. C2 in conjunction with L1 operate as a:
- A frequency divider
- B voltage divider
- C voltage doubler
- D frequency multiplier
Correct answer: D — frequency multiplier. From the official ISED question bank, verified word for word.
Why
In a frequency multiplier circuit, the inductor and variable capacitor form a tuned circuit that resonates at a specific multiple of the input signal, allowing only that higher frequency to pass through to the output. 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.