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The authors report all the possible four-impedance settings that yield a valid second-order two-stage Colpitts oscillator. These settings are obtained following an exhaustive search conducted on two possible structures of the oscillator modelled through two-port network transmission parameters. Only valid second-order cases with a maximum of three reactive elements are reported. Experimental and Spice verification of a selected example using both MOS and BJT transistors is given.
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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-cds.2010.0201
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