CRYSTAL OSCILLATOR BASED ON DUTY RATIO MEASUREMENT

Abstract: disclosed in the present invention is a crystal oscillator based on duty ratio measurement, comprising a first inverter, a resistor, a first load capacitor, a second load capacitor, first to fourth switches, a quartz crystal, a buffer, a sampling and holding module, a first comparator, a second comparator, a phase conversion module, a digital control module, and an energy injection module. one end of the quartz crystal is used for signal injection, a signal at the other end of the quartz crystal is sampled and processed, information representing phase error accumulation, i.e., a signal of which the duty ratio is continuously changing, is obtained by means of the first comparator, and finally the duty ratio is measured by means of the phase conversion module and the second comparator, so as to obtain an accurate moment of phase switching.

Inventor(s): Zixuan WANG, Xin WANG, Zhikuang CAI, Yufeng GUO, Jiafei YAO

CPC Classification: H03B5/04 (Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature)

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