NDLI: A tail current-shaping technique to reduce phase noise in LC VCOs

Content Provider	IEEE Xplore Digital Library
Author	Soltanian, B. Kinget, P.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. Eng., Columbia Univ., New York, NY, USA (Soltanian, B.; Kinget, P.)
Abstract	This paper presents a tail current shaping technique to improve phase noise in differential LC VCOs. The tail current is made large when the oscillator output voltage reaches its maximum or minimum value and when the sensitivity of the output phase to injected noise is the smallest; the tail current is made small during the zero crossings of the output voltage when the phase noise sensitivity is large. The proposed technique does not dissipate any extra power, does not use extra noisy active devices and occupies a small area. Besides better noise performance, a VCO with tail current shaping has a better DC to RF conversion and thus larger oscillation amplitude compared to a standard VCO with equal power dissipation. Measurement results for a 2 GHz differential NMOS LC-VCO with tail current shaping fabricated on a 0.25 /spl mu/m BiCMOS process are compared to measurements for a standard VCO in the same process. The phase noise improvement is more than 3 dB at the carrier frequency of 1.75 GHz. The measured phase noise at 3 MHz offset frequency is -134 dBc/Hz from a 1.75 GHz carrier and the VCO draws 1.5 mA from a 1.5 V supply.
Starting Page	579
Ending Page	582
File Size	239292
Page Count	4
File Format	PDF
ISBN	0780390237
DOI	10.1109/CICC.2005.1568734
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Tail Phase noise Voltage-controlled oscillators Noise shaping Current measurement Active noise reduction Noise level Radio frequency Power dissipation MOS devices
Content Type	Text
Resource Type	Article

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