OSCILLATOR, ELECTRONIC APPLIANCE USING THE OSCILLATOR, AND OSCILLATING METHOD OF THE OSCILLATOR

摘要

PROBLEM TO BE SOLVED: To realize a low-frequency crystal oscillator which has a good frequency-temperature characteristic by adding a frequency dividing circuit by using a SAW resonator in which the cutting direction of its crystal piece is improved. SOLUTION: A SAW resonator 12 of the present invention is the high-frequency SAW resonator in which a frequency-temperature characteristic is improved by improving the cutting angles of the crystal piece to an optical axis and an electrical axis. A Colpitts type oscillation circuit 13 is oscillated at a high frequency by using the SAW resonator 12 to generate an oscillation signal of high frequency (e.g. 400 MHz) and two differential signals which are 180°out of phase with each other are generated from the oscillation signal through a differential conversion circuit 14. The differential signals are frequency-divided to generate differential oscillation signals of low frequency (e.g. 100 MHz) and an output circuit 16 shapes the oscillation signals to generate output signals of low frequency (100 MHz). Consequently, a low-frequency crystal oscillator 11 is realized which has a good frequency-temperature characteristic. COPYRIGHT: (C)2004,JPO