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Title: Design of dual-band colpitts VCO by switched negative resistance shaping
Authors: Chen, Y.
Mouthaan, K. 
Keywords: Colpitts oscillator
Miller effect
negative resistance
voltage controlled oscillator
Issue Date: Jun-2011
Citation: Chen, Y., Mouthaan, K. (2011-06). Design of dual-band colpitts VCO by switched negative resistance shaping. Microwave and Optical Technology Letters 53 (6) : 1356-1360. ScholarBank@NUS Repository.
Abstract: A switched negative resistance shaping technique is proposed to design a dual-band Colpitts VCO.By making use of the Miller effect, the negative resistance of the Colpitts oscillator can be shaped with an additional switchable inductor-capacitor (LC) resonator placed between the base and the collector of the bipolar transistor. The shaping of the negative resistance guarantees oscillation to start at only the selected resonant mode when a multimode resonator is used at the input of the Colpitts oscillator. Using the proposed technique, a dual-band VCO is designed with center frequencies of 440 and 640 MHz. The measured continuous frequency tuning range is 15.8 and 16.3% for the lower band and the upper band, respectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1356-1360, 2011; View this article online at DOI 10.1002/mop.26020 Copyright © 2011 Wiley Periodicals, Inc.
Source Title: Microwave and Optical Technology Letters
ISSN: 08952477
DOI: 10.1002/mop.26020
Appears in Collections:Staff Publications

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