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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:
provide an RF ground at the VCC connection point of L1
Capacitor C3 acts as a bypass capacitor, ensuring that the VCC+ end of the L1-C2 tank circuit is effectively at RF ground, allowing the tank to resonate properly.
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