Patent ID: 8344813
Filing Date: 2013-01-01
Classification: H03L

Abstract:
1. A method comprising: comparing an output frequency of a first oscillator with a first reference signal from a reference oscillator; providing an up signal and a down signal as a function of the output frequency and first reference signal comparison, the up signal representing that a phase frequency of the first oscillator should be adjusted to increase the output frequency, the down signal representing that the phase frequency of the first oscillator should be adjusted to decrease the output frequency; monitoring a deviation of the up and down signals from at least one predetermined threshold; generating a first signal as a function of the deviation; comparing the first signal to at least one window threshold wherein the at least one window threshold is set based on at least one predetermined loop variable; generating a second signal as a function of the first signal and the at least one window threshold comparison; charging at least one capacitor utilizing the second signal or increasing the voltage of the second signal with the at least one capacitor based on at least one property of the at least one capacitor; and providing the second signal to the first oscillator.