Quartz crystal oscillator with temperature-compensated frequency characteristics.

摘要

A temperature-compensated crystal oscillator includes oscillating circuit (1), having a quartz crystal vibrator (3) as an oscillating element, for oscillating at a predetermined frequency, the oscillating circuit having frequency-temperature characteristics depending on a temperature, and the predetermined frequency being defined on the basis of the frequency-temperature characteristics, and temperature compensating circuit (10), coupled to the quartz crystal vibrator, for compensating the frequency-temperature characteristics of the oscillating circuit, the temperature compensating circuit including, first temperature compensating unit (11) for compensating the frequency-temperature characteristics of the oscillating circuit within a rated temperature range of the oscillating circuit to obtain compensated frequency-temperature characteristics, and second temperature compensating unit (12) for further compensating frequency-temperature characteristics in a specific temperature region in the compensated frequency-temperature characteristics to obtain desired frequency-temperature characteristics.