Radio Amateur Quiz Canadian License

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Question 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:

Correct Answer

frequency multiplier

Explanation

The L1-C2 tank circuit in the collector is tuned to a harmonic of the input frequency. The non-linear operation of the transistor generates harmonics, and the tank circuit selects and amplifies the desired one, thus performing frequency multiplication.

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