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Progress In Electromagnetics Research M
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A HIGH-SWING CLASS-C VCO WITH AMPLITUDE FEEDBACK LOOP FOR LOW PHASE NOISE AND ROBUST START-UP

By Q. Liu, Y.-B. Gan, and T.-C. Ye

Full Article PDF (365 KB)

Abstract:
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˚C to 100˚C.

Citation:
Q. Liu, Y.-B. Gan, and T.-C. Ye, "A High-Swing Class-C VCO with Amplitude Feedback Loop for Low Phase Noise and Robust Start-Up," Progress In Electromagnetics Research M, Vol. 85, 125-134, 2019.
doi:10.2528/PIERM19071803

References:


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