Title :
A microcomputer-compensated crystal oscillator using a dual-mode resonator
Author :
Benjaminson, A. ; Stallings, S.C.
Author_Institution :
Gen. Tech. Services Inc., Alexandria, VA, USA
fDate :
31 May-2 Jun 1989
Abstract :
The system described uses microcomputer-controlled compensation wherein the correction is implemented by adding a computed offset frequency to the output of a stable oscillator. Temperature sensing is done by the use of a dual-mode oscillator system using two C-modes of an SC-cut crystal, which are combined to produce a temperature-sensitive difference frequency. System accuracies of ±20 p.p.b. have been achieved over a temperature range of -55°C to +85°C
Keywords :
compensation; computerised control; crystal resonators; frequency control; microcomputer applications; oscillators; -55 to 85 degC; C-modes; SC-cut crystal; computed offset frequency; dual-mode resonator; microcomputer-compensated crystal oscillator; temperature-sensitive difference frequency; Aging; Calibration; Clocks; Counting circuits; Frequency conversion; Oscillators; Polynomials; Temperature control; Temperature distribution; Temperature sensors;
Conference_Titel :
Frequency Control, 1989., Proceedings of the 43rd Annual Symposium on
Conference_Location :
Denver, CO
DOI :
10.1109/FREQ.1989.68854
