負性容量を適用したLC発振回路における発振モード

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  • Oscillation mode change in LC oscillator using negative capacitance

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Frequency tuning range of on-chip RF VCOs are narrow due to parasitic capacitances. This paper presents a technique for extending the variable frequency range of VCO, by using negative capacitance circuit to cancel out the parasitic capacitance and a capacitor. The negative capaciance is realized by using an negative impedance converter(NIC). Frequency limit of the proposed negative capacitance is analized theoretically. We applied the negative capacitance to a VCO succesfully but with small parasitic oscillation in its oscillation mode.

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