Patent ID: 8975970
Filing Date: 2015-03-10
Classification: H03L

Abstract:
1. A method of producing an output signal having a desired frequency from a controlled oscillator comprising: measuring a temperature associated with the controlled oscillator at a predetermined setting of the controlled oscillator; determining a first frequency of the output signal of the controlled oscillator based on the measured temperature; receiving the output signal and another output signal from another oscillator at a frequency ratio measuring circuit; calculating a first frequency ratio in the frequency ratio measuring circuit by comparing the determined first frequency of the output signal generated by the controlled oscillator and a second frequency of the other output signal from the other oscillator; calculating a desired frequency ratio between the desired frequency of the output signal generated by the controlled oscillator and the second frequency of the other output signal from the other oscillator, using the first frequency ratio and the desired frequency; changing the output signal to have the desired frequency by tuning the controlled oscillator until the desired frequency ratio is substantially achieved.