A kind of fast start-up circuit and fast start-up method

Abstract

The present invention provides a quick start-up circuit and a quick start-up method. The fast start-up circuit includes: a multi-phase oscillator, a control circuit, a phase selection circuit, a driving circuit and a crystal oscillator circuit; wherein, the multi-phase oscillator is used to generate a plurality of clocks with different phases; the control circuit is used to generate the initial injection signal and The cycle injection signal is used to control the opening and closing of the driving circuit; the phase selection circuit is connected to the multi-phase oscillator and the control circuit, and is used to select the appropriate phase clock from multiple clocks of different phases according to the cycle injection signal, and pass the driving circuit. Drive the crystal oscillator circuit with the selected clock. In this application, an appropriate phase can be selected for injection to achieve a stable injection effect and start-up speed, which greatly reduces the requirements for the injection clock accuracy; and the same circuit can be applied to crystal oscillators of different frequencies, which not only increases the reliability of the circuit , it also avoids the requirement for the oscillator start-up time and reduces the difficulty of circuit design.

Description

technical field [0001] The invention relates to the field of crystal oscillators, in particular to a fast start-up circuit and a fast start-up method of the crystal oscillator. Background technique [0002] In portable electronic devices, due to limited battery power, power consumption greatly affects the experience of using the electronic device. After the electronic device is turned on, it is not always in the working mode but wakes up periodically, and is in a sleep mode with extremely low power consumption during the non-waking period. The average power consumption of the device is mainly determined by the power consumption during wake-up, the length of the wake-up time and the power consumption of sleep, and the wake-up time is divided into the time for waiting for the crystal oscillator to stabilize and the system running time. Therefore, the shorter the time required for the crystal oscillator to work stably from wake-up, the lower the average power consumption of th...

AI Technical Summary

Problems solved by technology

[0005] The invention discloses a fast start-up circuit and a fast start-up method of a crystal oscillator to solve the uncontrollable error between the frequency of the existing non-crystal oscillator and the frequency of the crystal oscillator due to the process deviation, so that the injection effect and the start-up speed Difficult to guarantee

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