Rapid oscillation starting circuit and rapid oscillation starting method

Abstract

The invention provides a rapid oscillation starting circuit and a rapid oscillation starting method. The rapid oscillation starting circuit comprises a multi-phase oscillator, a control circuit, a phase selection circuit, a drive circuit and a crystal oscillation circuit, wherein the multi-phase oscillator is used for generating a plurality of clocks with different phases; the control circuit is used for generating an initial injection signal and a periodic injection signal and controlling the opening and closing of the driving circuit; and the phase selection circuit is connected with the multi-phase oscillator and the control circuit, and is used for selecting a clock with a proper phase from a plurality of clocks with different phases according to the periodic injection signal, and driving the crystal oscillation circuit with the selected clock through the driving circuit. According to the invention, an appropriate phase can be selected for injection, a stable injection effect and oscillation starting speed are achieved, and the requirement on the precision of an injection clock is greatly reduced; moreover, the same circuit can be suitable for crystal oscillators with differentfrequencies, so the reliability of the circuit is improved, the requirement on the starting time of the oscillator is avoided, and the circuit design difficulty is reduced.

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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