IEEE--How Phase Noise Appears in Oscillators(by Asad A. Abidi)

semico_ljj

How Phase Noise Appears in Oscillators
Asad A. Abidi
Integrated Circuits & Systems Laboratory
Electrical Engineering Department
University of California, Los Angeles

ABSTRACT
Wireless transceivers closely specify the phase noise
in the local oscillator. Yet it is not very well
understood how phase noise is predicted, especially
in oscillators which do not use a passive resonator. It
is also difficult to model flicker noise in the close-in
phase noise spectrum. This is a qualitative
discussion of the various physical processes
responsible for phase noise production, particularly
in CMOS oscillators, and it offers a common
treatment of resonator-based oscillators, ring
oscillators, and relaxation oscillators.


This chapter appears in the book "Analog Circuit Design-RF Analog-to-
Digital Con-
verters; Sensor and Actuator Interfaces; Low-Noise Oscillators,
PLLs and Synthesizers", published by
Kluwer Academic Publishers, Boston,
November 1997, 428 pp. Hard-bound, ISBN 0-7923-9968-4

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