Producing a desired frequency using a controlled oscillator with known temperature sensitivity
First Claim
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.
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Accused Products
Abstract
A controlled oscillator is tuned to produce a desired, temperature independent frequency. A first frequency ratio is determined between a first frequency of the output signal generated by the controlled oscillator and a frequency of an output signal from another oscillator. The first frequency is determined based on a sensed temperature. A desired frequency of the output signal of the controlled oscillator is used to determine a desired frequency ratio between the desired frequency and the frequency of the output signal from the other oscillator. The controlled oscillator is tuned and the frequency ratio measured until the tuning has caused the desired frequency ratio to be achieved, thereby causing the controlled oscillator to provide the desired frequency.
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Citations
24 Claims
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1. A method of producing an output signal having a desired frequency from a controlled oscillator comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus comprising:
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a controlled oscillator to supply a controlled oscillator output signal; a second oscillator to supply a second oscillator output signal; a frequency ratio measurement circuit coupled to the controlled oscillator output signal and the second oscillator output signal, and to generate and to supply respective indications of measured frequency ratios between the controlled oscillator output signal and the second oscillator output signal; and a control circuit coupled to receive the indications of the measured frequency ratios and compare the measured frequency ratios to a desired frequency ratio and to adjust tuning of the controlled oscillator until the desired frequency ratio is substantially achieved between a desired frequency of the controlled oscillator output signal and the second oscillator output signal, wherein the desired frequency ratio is calculated using the desired frequency and a first frequency ratio, wherein the first frequency ratio is calculated by comparing a determined first frequency of the controlled oscillator output signal and a second frequency of the second oscillator output signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A computer program stored on computer readable storage media, operable when executed on a processor to cause the processor:
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to determine a first frequency of a controlled oscillator output signal from a controlled oscillator based on a measured temperature at a predetermined setting of the controlled oscillator to thereby determine a known first frequency; to calculate a first frequency ratio between the known first frequency of the controlled oscillator output signal and a second frequency of a second oscillator output signal from a second oscillator; to calculate a desired frequency ratio between a desired frequency of the controlled oscillator output signal and a frequency of a second oscillator output signal from a second oscillator, using the first frequency ratio and the desired frequency; and to iteratively provide control values to tune the controlled oscillator until a measured frequency ratio between the controlled oscillator output signal and the second oscillator output signal is substantially equal to the desired frequency ratio. - View Dependent Claims (24)
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Specification