• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.1 s.343
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• pp.149-155
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• 2006

A technique used to induce maximum oscillating voltage in the BJT Clapp VCO is presented. The technique finds the optimal feedback capacitance values resulting in the largest oscillating signal swing across the resonator at a given bias state and the VCO's center frequency. By doing so, the presented technique attains the lowest phase noise which the BJT Clapp VCO can have. An analysis of the measurement results of the fabricated oscillators has verified that the VCO with the optimal feedback capacitance values actually exhibits the lowest phase noise.