DocumentCode :
2656953
Title :
Sequenced mode TCXO
Author :
Frerking, Marvin E.
Author_Institution :
Innovative Technology Products, Inc
fYear :
2012
fDate :
21-24 May 2012
Firstpage :
1
Lastpage :
6
Abstract :
TCXO´s first became available in the early 1960´s. The accuracy was limited to about 0.5 ppm by the degree to which the analog thermistor networks could track the crystal temperature curve. The advent of digital compensation eliminated the curve fitting problem, but accuracy was still limited to about 0.1 ppm due to retrace problems in the oscillator. Making the oscillator pullable also made it less stable. The effect was reduced by synthesizing the output frequency in some way rather than pulling the crystal to frequency. This also allowed the use of SC-cut crystals and improved the accuracy to a few parts in 108. Dual mode temperature sensing improved thermal tracking, but hysteresis effects in the crystal still limited the accuracy. Implementation of a dual mode oscillator presents some challenges that, depending on the circuit, may result in additional hysteresis being introduced by circuit elements.
Keywords :
oscillators; temperature sensors; thermistors; SC-cut crystals; analog thermistor networks; circuit element; crystal temperature curve; digital compensation; dual mode temperature sensing; fitting problem; oscillator; sequenced mode TCXO; thermal tracking; Crystals; Frequency measurement; Hysteresis; Oscillators; Temperature distribution; Temperature measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Frequency Control Symposium (FCS), 2012 IEEE International
Conference_Location :
Baltimore, MD
ISSN :
1075-6787
Print_ISBN :
978-1-4577-1821-2
Type :
conf
DOI :
10.1109/FCS.2012.6243577
Filename :
6243577
Link To Document :
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