A Method to Increase the Frequency Stability of a TCXO by Compensating Thermal Hysteresis
1
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
2
State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(23), 6812; https://doi.org/10.3390/s20236812
Received: 12 October 2020
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Revised: 25 November 2020
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Accepted: 25 November 2020
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Published: 28 November 2020
(This article belongs to the Special Issue Low Power Sensors for Wireless Communication and Localization)
Due to the rapid growth of electronic information technology, the need for the higher stability of crystal oscillators has increased. The temperature-compensated X’tal (crystal) oscillator (TCXO), a type of crystal oscillator with high frequency stability, has been widely used in communications, sensor networks, automotive electronics, industrial control, measuring devices, and other equipment. The traditional TCXO only performs frequency compensation based on the current temperature, without considering the error caused by thermal hysteresis. As the frequency stability of the TCXO improves, the thermal hysteresis of the crystal oscillator has a negligible influence on the frequency stability of the crystal oscillator. This study measured different compensation tables for hysteresis curves at different temperatures and used a microprocessor to store the historical information of crystal temperature changes. Furthermore, corresponding algorithms were designed to select the correct values, according to the temperature change history, to compensate for the thermal hysteresis of the crystal oscillator error. Experiments show that this method can reduce the hysteresis error of the crystal oscillator from 700 to 150 ppb (−40 to 80 °C).
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Keywords:
TCXO; crystal oscillator; thermal hysteresis; digital compensation
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MDPI and ACS Style
Wang, Z.; Wu, J. A Method to Increase the Frequency Stability of a TCXO by Compensating Thermal Hysteresis. Sensors 2020, 20, 6812. https://doi.org/10.3390/s20236812
AMA Style
Wang Z, Wu J. A Method to Increase the Frequency Stability of a TCXO by Compensating Thermal Hysteresis. Sensors. 2020; 20(23):6812. https://doi.org/10.3390/s20236812
Chicago/Turabian StyleWang, Zhaoyang, and Jie Wu. 2020. "A Method to Increase the Frequency Stability of a TCXO by Compensating Thermal Hysteresis" Sensors 20, no. 23: 6812. https://doi.org/10.3390/s20236812
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