Crystal oscillation circuit capable of rapidly starting oscillation and oscillation starting method

Abstract

The embodiment of the invention discloses a crystal oscillation circuit capable of rapidly starting oscillation and an oscillation starting method. The crystal oscillation circuit may include a control portion, a ring oscillator portion, and a crystal oscillation portion, wherein the control portion is configured to provide a variable voltage or a variable current to the ring oscillator portion; the ring oscillator portion is configured to generate a control signal for injecting the crystal oscillation portion according to the variable voltage or the variable current, wherein the frequency ofthe control signal changes from high to low along with time, and the change range covers the corresponding target frequency when a crystal oscillator in the crystal oscillation portion starts to oscillate; and the crystal oscillation portion is configured to reduce the frequency corresponding to the control signal to the target frequency, and promote the crystal oscillator to start oscillation based on the control signal and resonance energy generated by the crystal oscillator in the crystal oscillation portion.

Description

Technical field [0001] The embodiment of the present invention relates to the field of electronic technology, and in particular to a crystal oscillator circuit with a rapid start-up and a start-up method. Background technique [0002] Crystal Oscillator (CO, Crystal Oscillator) is abbreviated as crystal oscillator. It is an oscillator with high precision, high stability and high quality factor. In electronic circuit applications, it can be used with other components to generate a standard pulse signal with a specific oscillation frequency as Clock signal or provide reference signal for specific system. [0003] For conventional crystal oscillator circuits, there has always been a problem of too long start-up time, which usually reaches the millisecond level. Take low-power chips as an example, especially those with sleep wake-up function. The long start-up time seriously affects the wake-up time of the chip, especially in the practice of frequent wake-up, which more seriously affe...

AI Technical Summary

Problems solved by technology

Taking low-power chips as an example, especially chips with sleep wake-up function, the long start-up time seriously affects the chip wake-up time, especially in the practice of frequent wake-up, which affects the performance of the chip more seriously; and At the same time, due to the lengthening of the wake-up time, other working parts in the electronic system integrating the chip will wait for the clock signal sent after the crystal oscillator starts to oscillate during the start-up time period, so a Unnecessary power consumption, which is unacceptable for low power consumption scenarios, especially IoT mobile device scenarios

Images