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Measurement of Allan variance and phase noise at fractions of a millihertz

Bruce L. Conroy, Duc-Tai Le

Abstract

Although the measurement of Allan variance of oscillators is well documented, there is a need for a simplified system for finding the degradation of phase noise and Allan variance step-by-step through a system. This article describes an instrumentation system for simultaneous measurement of additive phase noise and degradation in Allan variance through a transmitter system. Also included are measurements of a 20-kW X-band transmitter showing the effect of adding a pass tube regulator.

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Available abstract

Key concepts: Allan variance, Transmitter, Noise (video), Phase noise, Instrumentation (computer programming), Variance (accounting), Phase (matter), Degradation (telecommunications)