Abstract:This paper presents an active capacitance circuit using a LC series-feedback scheme. The noise performance is excellent and the good stability is accomplished by adjusting the feedback elements. We analyze the circuit performances in detail and apply it to a voltage controlled oscillator. The active capacitance circuit provides negative resistance that can compensate not only the loss of varactor diode but also the parasitic resistance of inductor. A VCO employing the active capacitance circuit is designed at … Show more
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