CPC H03B 5/06 (2013.01) [H03B 5/36 (2013.01); H03L 7/099 (2013.01)] | 21 Claims |
1. A method for starting up a crystal oscillator circuit comprising:
configuring portions of a phase-locked loop (PLL) using stored parameters, the configuring being responsive to a wakeup event;
generating an injection clock signal using the PLL configured with the stored parameters, the injection clock signal having a frequency that is substantially equal to a crystal oscillator frequency of the crystal oscillator circuit;
supplying the injection clock signal to the crystal oscillator circuit;
generating anti-phase signals using the injection clock signal; and
injecting the anti-phase signals into a crystal during startup of the crystal oscillator circuit.
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