Analysis of an Active Capacitance Circuit and Its Application to VCO

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...

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Bibliographic Details
Main Authors: Sang-June Cho, Young-Ho Cho, Hyung-Il Back, Sang-Won Yun
Format: Conference Proceeding
Language:English
Subjects:
Active circuits
Active inductors
bipolar transistors
Circuit analysis
Circuit noise
Circuit stability
Diodes
Feedback
negative resistance circuits
Parasitic capacitance
Performance analysis
Varactors
Voltage-controlled oscillators
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Summary: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 2.179-2.191 GHz and the phase noise is -104.67dBc/Hz at 10 kHz offset within the tuning range
ISSN:0149-645X
DOI:10.1109/MWSYM.2006.249743