NDLI: Physical processes of phase noise in differential LC oscillators

Content Provider	IEEE Xplore Digital Library
Author	Rael, J.J. Abidi, A.A.
Copyright Year	2000
Description	Author affiliation: Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA (Rael, J.J.)
Abstract	There is an unprecedented interest among circuit designers today to obtain insight into the mechanisms of phase noise in LC oscillators. For only with this insight is it possible to optimize oscillator circuits using low-quality integrated resonators to comply with the exacting phase noise specifications of modern wireless systems. In this paper we concentrate on an understanding of the popular differential LC oscillator. We introduce simple models to capture the nonlinear processes that convert voltage or current thermal noise in resistors or transistors into phase noise in the oscillator. The analysis does not require hypothetical elements, such as limiters or amplitude control loops, to fully explain phase noise. A simple expression at the end accurately specifies thermally induced phase noise, and lends substance to Leeson's original hypothesis. Next, the upconversion of flicker noise into phase noise is traced to mechanisms first identified in the 1930's, but apparently since forgotten. Unlike thermally induced phase noise, which appears as phase modulation sidebands, flicker noise is shown to upconvert by bias-dependent frequency modulation. The results are validated against SpectreRF simulations and measurements on two differential CMOS oscillators tuned by resonators with very different Q's.
Starting Page	569
Ending Page	572
File Size	412097
Page Count	4
File Format	PDF
ISBN	0780358090
DOI	10.1109/CICC.2000.852732
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-05-24
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase noise Oscillators 1f noise Circuits Steady-state Phase modulation Frequency modulation Voltage Noise level Additive noise
Content Type	Text
Resource Type	Article

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