Title :
Ultra-stable OCXO using dual-mode crystal oscillator
Author :
Watanabe, Yasuaki ; Ozaki, Kiyoharu ; Goka, Shigeyoshi ; Sekimoto, Hitoshi
Author_Institution :
Tokyo Metropolitan Univ., Japan
Abstract :
A high-stability oven controlled crystal oscillator (OCXO) (frequency stability; ±0.5 ppb from -10 to +50°C) has been developed using a dual-mode SC-cut quartz crystal oscillator. The OCXO described here uses a conventional oven control system for coarse compensation and a digital correction system, which uses B-mode signals as a temperature sensor, for fine compensation. These compensations combine to greatly improve the C-mode frequency stability when the ambient temperature changes. The experimental results indicated that the proposed OCXO had a frequency-temperature stability 60 times better than that of a free-running mode oscillator
Keywords :
active networks; compensation; crystal oscillators; frequency stability; -10 to 50 C; B-mode signals; C-mode frequency stability; Colpitts oscillator; SC-cut quartz crystal oscillator; active circuit; coarse compensation; digital correction system; dual-mode crystal oscillator; fine compensation; frequency-temperature stability; oven control system; oven controlled crystal oscillator; temperature sensor; ultra-stable OCXO; Circuits; Communication system control; Control systems; Oscillators; Ovens; Resonant frequency; Resonator filters; Stability; Temperature control; Temperature sensors;
Conference_Titel :
Frequency Control Symposium and Exhibition, 2000. Proceedings of the 2000 IEEE/EIA International
Conference_Location :
Kansas City, MO
Print_ISBN :
0-7803-5838-4
DOI :
10.1109/FREQ.2000.887400
