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Proceedings Paper

Limit parameters of GPS disciplined quartz frequency sources
Author(s): Krzysztof Weiss; Aleksander Lisowiec; Wojciech Steplewski
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Paper Abstract

Fivefold decrease of RMS jitter of 1 pps pulse from GPS receiver after SA switch-off and relatively short period required to filter it out has enabled the construction of GPS synchronized frequency sources of parameters almost order of magnitude better than with SA. New design challenge has been to achieve 10-11 frequency accuracy over time period of 1000 seconds. Basic block diagram of GPS disciplined frequency source is presented in fig 1. The only non purely digital blocks of the source are quartz oscillator and digital to analog converter D/A and their specs decide about the parameters of the output frequency signal. Design requirements for internal quartz oscillator as well as digital to analog converter based on required minimal frequency control loop time of about 10000 seconds have been derived and presented. To summarize, quartz oscillator has to exhibit aging not worse than 3 • 10-11/24h and temperature coefficient 1•10-12/°C while digital to analog converter has to be an 18-bit device with 1 LSB differential nonlinearity and extremely low temperature coefficient. Alternately as devices with very low temperature drift are very expensive, the converter can take its reference voltage from the oscillator, where the reference source is temperature stabilized. This of course places higher demands on the oscillator voltage reference source.

Paper Details

Date Published: 24 September 2004
PDF: 4 pages
Proc. SPIE 5582, Advanced Optoelectronics and Lasers, (24 September 2004); doi: 10.1117/12.583378
Show Author Affiliations
Krzysztof Weiss, Tele and Radio Research Institute (Poland)
Aleksander Lisowiec, Tele and Radio Research Institute (Poland)
Wojciech Steplewski, Tele and Radio Research Institute (Poland)

Published in SPIE Proceedings Vol. 5582:
Advanced Optoelectronics and Lasers
Igor A. Sukhoivanov; Vasily A. Svich; Alexander V. Volyar; Yuriy S. Shmaliy; Sergy A. Kostyukevych, Editor(s)

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