Circuit and method to start a crystal oscillator
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United States of America Patent
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May 4, 2021
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N/A
app pub date -
Oct 21, 2020
filing date -
Jul 14, 2020
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Abstract
Embodiments of circuits and methods for starting a crystal oscillator are disclosed herein. In one example, an oscillation circuit is disclosed. The oscillation circuit includes a multi-phase oscillator, a control circuit, a phase selection circuit, a drive circuit, and a crystal oscillator. The multi-phase oscillator is configured to generate candidate clock signals of multiple phases. The phase selection circuit is coupled to the multi-phase oscillator and configured to select a clock signal from the candidate clock signals. The drive circuit is coupled to the phase selection circuit and configured to inject the selected clock signal to the crystal oscillator for a period of time determined by the control circuit. The control circuit is coupled to the phase selection circuit and the drive circuit and is configured to control the on and off of the drive circuit and output a plurality of injections signals.
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