Advanced Qualification · A-002 Advanced components and circuits · A-002-009-010
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. C3 is a:
- Atuning capacitor
- Bcoupling capacitor
- CRF by-pass capacitor
- DDC blocking capacitor
Correct answer: C — RF by-pass capacitor. From the official ISED question bank, verified word for word.
Why
In this circuit, the fixed capacitor C3 provides a low-resistance path for radio frequency signals to flow directly to ground, preventing them from reaching the power supply. 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.
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