Publication Date

1975

Document Type

Dissertation/Thesis

First Advisor

Newell, D. E.

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Industry and Technology

LCSH

Oscillators; Crystal--Noise

Abstract

This study presents a logical technique for the analysis and design of low noise crystal oscillator circuits, Basic noise mechanisms are reviewed, such as thermal noise and l/F noise. The quartz crystal is represented as a noise equivalent circuit and the crystal's noise contributions are derived. The active circuit is then discussed using the hybrid rr model. Considera­tions are given for the shot noise currents and the effects of the base spreading resistance on the best achievable noise performance. Since noise is a random phenomena, statistical calcula­tions such as the Allan Variance, Standard Deviation and the Autocorrelation Function are derived. The spectral density is represented in the frequency domain and a conversion technique for frequency domain data to time domain is developed. The con­version allows a fast method of representing the short-term stability of an oscillator. Measurement techniques for the collection of noise data are discussed using the frequency counter and the spectrum analyzer. Finally, a computer program called "NOISEY" was designed as an aide in evaluating crystal oscillator circuits. "NOISEY" looks at the crystal's equivalent noise circuit in junction with the active device of the oscillator. An evaluation can be made of the performance of an oscillator for noise content using this program.

Comments

Includes bibliographical references (leaf 95)

Extent

109 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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