Advanced Qualification · A-002 Advanced components and circuits · A-002-009-007
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. A fixed capacitor (C3) is connected between the VCC+ side of L1 and ground. The purpose of C3 is to:
- Aresonate with L1
- Bby-pass any audio components
- Cprovide an RF ground at the VCC connection point of L1
- Dform a pi filter with L1 and C2
Correct answer: C — provide an RF ground at the VCC connection point of L1. From the official ISED question bank, verified word for word.
Why
In a frequency multiplier, the power supply line must not let radio frequency energy escape or cause instability. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account