Crystal oscillator circuit

Abstract

The invention discloses a crystal oscillator circuit which comprises a first crystal oscillator, a second crystal oscillator and an output control circuit. The frequency stabilization time of the second crystal oscillator is shorter than that of the first crystal oscillator. The output control circuit is used for outputting signals generated by the second crystal oscillator before the frequency of the first crystal oscillator is stabilized and outputting signals generated by the first crystal oscillator after the frequency of the first crystal oscillator is stabilized. The work performance of the crystal oscillator circuit is ensured, and waiting time of normal work of the crystal oscillator circuit after the crystal oscillator circuit is electrified is greatly shortened.

Description

technical field [0001] The invention relates to the field of crystal oscillator manufacturing, in particular to a crystal oscillator circuit. Background technique [0002] Quartz crystal oscillator is a high-precision and high-stability oscillator, which is widely used in various oscillating circuits such as color TVs, computers, remote controls, and as a frequency generator in communication systems to generate clock signals for data processing equipment and provide a reference signal for a particular system. [0003] Oven-controlled crystal oscillator (OCXO) is currently the crystal oscillator with the highest frequency stability and precision. It has excellent performance in terms of aging rate, temperature stability, long-term stability and short-term stability. Therefore, as a precision time Frequency signal sources are widely used in various fields. [0004] At present, when the thermostatically controlled crystal oscillator is just powered on at room temperature, its...

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Problems solved by technology

After power-on, the output frequency of the crystal oscillator changes rapidly with the heating process of the constant temperature circuit to the constant temperature bath, until the constant temperature bath reaches a stable temperature point, and the output frequency of the constant temperature control crystal oscillator generally takes more than 2 minutes to reach the nominal frequency. The deviation is within 2ppm, and the frequency stabilization time is long, which leads to a long time for the circuit using the constant temperature control crystal oscillator to work normally after power-on.

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