NDLI: Phase Noise in <emphasis emphasistype=italic>LC</emphasis> Oscillators: A Phasor-Based Analysis of a General Result and of Loaded <formula formulatype=inline> <tex Notation=TeX>$Q$</tex></formula>

Content Provider	IEEE Xplore Digital Library
Author	Murphy, D. Rael, J.J. Abidi, A.A.
Copyright Year	2004
Abstract	Recent work by Bank, and Mazzanti and Andreani has offered a general result concerning phase noise in nearly-sinusoidal inductance-capacitance (LC) oscillators; namely that the noise factor of such oscillators (under certain achievable conditions) is largely independent of the specific operation of individual transistors in the active circuitry. Both use the impulse sensitivity function (ISF). In this work, we show how the same result can be obtained by generalizing the phasor-based analysis. Indeed, as applied to nearly-sinusoidal LC oscillators, we show how the two approaches are equivalent. We analyze the negative-gm LC model and present a simple equation that quantifies output noise resulting from phase fluctuations. We also derive an expression for output noise resulting from amplitude fluctuations. Further, we extend the analysis to consider the voltage-biased LC oscillator and fully differential CMOS LC oscillator, for which the Bank's general result does not apply. Thus we quantify the concept of loaded Q.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	1187
Ending Page	1203
Page Count	17
File Size	1837956
File Format	PDF
ISSN	15498328
Volume Number	57
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase noise Voltage-controlled oscillators Circuit noise Active noise reduction Fluctuations Jacobian matrices Semiconductor device modeling Equations Noise level phase noise Impulse sensitivity function noise factor oscillators, voltage controlled oscillator
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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