NDLI: A study of capacitor-coupled varactor VCO to investigate flicker noise up-conversion mechanism

Content Provider	IEEE Xplore Digital Library
Author	Itoh, N.
Copyright Year	2005
Description	Author affiliation: Dept. of Analog RF Syst. Eng., Toshiba Corp., Yokohama, Japan (Itoh, N.)
Abstract	CCV-VCO (capacitor-coupled varactor VCO) has been studied with a view to suppressing flicker noise up-conversion. The mechanisms of flicker noise up-conversion to f/sup 3/ phase noise utilize three paths; direct modulation, folding by non-linearity of oscillation, and tail current up-conversion at common node. Designed NMOS-VCO satisfied to avoid f/sup 3/ phase noise by direct modulation pass. Measured phase noise at 10 kHz offset from carrier was -74 dBc/Hz at 2.9 GHz oscillation frequency, and the corner frequency between f/sup 3/ phase noise and f/sup 2/ phase noise was approximately 20 kHz. The current consumption was 6 mA with 1.8 V. The 1 MHz FOM of VCO was 182 dB and 10 kHz FOM of VCO was 173 dB.
Starting Page	157
Ending Page	160
File Size	2017731
Page Count	4
File Format	PDF
ISBN	0780393724
DOI	10.1109/RFIT.2005.1598899
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-11-30
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Varactors Phase noise Phase modulation Voltage-controlled oscillators Tail Bandwidth MOSFET circuits Frequency Mobile communication 1f noise
Content Type	Text
Resource Type	Article

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A study of capacitor-coupled varactor VCO to investigate flicker noise up-conversion mechanism