Title :
Digitally compensated crystal oscillator based on the self crystal as temperature sensor
Author :
Azcondo, Francisco J. ; Peire, J.
Author_Institution :
Dept. de Electron., Cantabria Univ., Burgos, Spain
Abstract :
Digital compensation in temperature techniques for crystal oscillators is presented. Error due to temperature and compensation data resolution is evaluated. Different thermal coefficients between sensor and crystal are studied through experiments on dynamic and static sweeps in temperature. A sensor based on the crystal oscillator has been used to reduce the uncertainty gap in compensation. A specific integrated circuit has been designed to produce thermal data from a dual mode oscillator and correct the output frequency. The calibration function has been programmed in a HCMOS microcontroller, where the thermal transient is evaluated to optimize power consumption
Keywords :
compensation; computerised instrumentation; crystal resonators; electric sensing devices; measurement errors; radiofrequency oscillators; temperature measurement; HCMOS microcontroller; calibration function; compensation; computerised instrumentation; crystal oscillator; data resolution; dual mode oscillator; integrated circuit; measurement errors; output frequency; power consumption; self crystal; temperature sensor; thermal coefficients; thermal transient; uncertainty gap; Calibration; Error correction; Frequency conversion; Oscillators; Stability; Temperature dependence; Temperature distribution; Temperature sensors; Varactors; Virtual colonoscopy;
Conference_Titel :
Industrial Electronics, Control, Instrumentation, and Automation, 1992. Power Electronics and Motion Control., Proceedings of the 1992 International Conference on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0582-5
DOI :
10.1109/IECON.1992.254364
