FREQUENCY TEMPERATURE COMPENSATION TECHNIQUES FOR QUARTZ CRYSTAL OSCILLATORS.
Abstract
This document describes techniques of temperature compensation of quartz crystal oscillators. The mathematical and empirical analysis of four different methods is presented. In each method, to obtain compensation of the temperature coefficient, a change in the frequency of the crystal is produced that is equal and opposite in sense to the change caused by temperature. The means for producing a compensating frequency change is accomplished by changing the load reactance at the crystal terminals. The four different methods are identified by the element that is used as the reactance modulator. The different methods utilize either a varicap (voltage variable capacitor diode), a transistor, a binistor or a forward-biased diode as the modulating element. In each case the change in the reactance of these elements is controlled by thermistor networks. Other studies concerned with compensation techniques such as methods of controlling voltage changes and data on the aging of experimental models are presented. The results of experimental tests on compensation circuits and compensated oscillators are given. The compensation of one 3-mc oscillator was within = 3 X 10 to the minus seventh power from -40 C to +70C. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 28, 1963
- Accession Number
- AD0437825
Entities
People
- R. H. Bangert