A HIGH-SWING CLASS-C VCO WITH AMPLITUDE FEEDBACK LOOP FOR LOW PHASE NOISE AND ROBUST START-UP

A novel high-swing Class-C VCO with an amplitude feedback loop is presented. The amplitude feedback loop is used to ensure the start-up of the VCO which also makes the proposed VCO always have an optimal phase noise against the PVT variations automatically. The proposed circuit is implemented in a 6...

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Veröffentlicht in:Progress in electromagnetics research M Pier M 2019-01, Vol.85, p.125-134
Hauptverfasser: Liu, Qi, Gan, Ye-Bing, Ye, Tian-Chun
Format: Artikel
Sprache:eng
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Zusammenfassung:A novel high-swing Class-C VCO with an amplitude feedback loop is presented. The amplitude feedback loop is used to ensure the start-up of the VCO which also makes the proposed VCO always have an optimal phase noise against the PVT variations automatically. The proposed circuit is implemented in a 65 nm CMOS process. The VCO has exhibited a measured phase noise of -128.6 dBc/Hz at 1 MHz offset from the 1.52 GHz carrier frequency with a 1.4 mW power consumption. The variation of measured phase noise at 1 MHz offset is less than 2.3% while temperature changes from -40[degrees]C to 100[degrees]C.
ISSN:1937-8726
1937-8726
DOI:10.2528/pierm19071803