Generating a tuned frequency output from a signal generator
AssigneeCambridge Silicon Radio Limited
InventorsDuncan Angus McLeod, Michael John Story
Life of this patent
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Abstract
A method of tuning the frequency of a generated signal to form an output signal including: forming the generated signal at a signal generator; comparing a feedback signal with a reference signal and generating a control signal in dependence on that comparison, wherein the feedback signal is generated using the output signal; and generating the output signal by performing a frequency-dividing operation in dependence on the generated signal and a dividing factor, wherein the dividing factor is determined in dependence on the control signal.
Claims20
A method of tuning the frequency of a generated signal to form an output signal comprising:
- forming the generated signal at a signal generator, wherein the signal generator has no inputs;
- comparing a feedback signal with a reference signal and generating a control signal in dependence on that comparison, wherein the feedback signal is generated using the output signal;
- and
- generating the output signal by performing a frequency-dividing operation in dependence on the generated signal and a dividing factor, wherein the dividing factor is determined in dependence on the control signal.
A method of tuning the frequency of a generated signal to form an output signal comprising:
- forming the generated signal at a signal generator;
- comparing a feedback signal with a reference signal and generating a control signal in dependence on that comparison, wherein the feedback signal is generated using the output signal;
- and
- generating the output signal by performing a frequency-dividing operation in dependence on the generated signal and a dividing factor, wherein the dividing factor is determined in dependence on the control signal;
- wherein the frequency dividing operation comprises performing a plurality of frequency divisions on the generated signal, wherein in each of the plurality of frequency divisions the generated signal is frequency divided by an intermediary value such that the average of the intermediary values for the frequency dividing operation is equal to the dividing factor.
A method of tuning the frequency of a generated signal to form an output signal comprising:
- forming the generated signal at a signal generator;
- comparing a feedback signal with a reference signal and generating a control signal in dependence on that comparison, wherein the feedback signal is generated using the output signal;
- and
- generating the output signal by performing a frequency-dividing operation in dependence on the generated signal and a dividing factor, wherein the dividing factor is determined in dependence on the control signal;
- wherein the frequency dividing operation is performed by a divider unit, and the divider unit comprises an error shaper.
A method of tuning the frequency of a generated signal to form an output signal comprising:
- forming the generated signal at a signal generator;
- comparing a feedback signal with a reference signal and generating a control signal in dependence on that comparison, wherein the feedback signal is generated using the output signal;
- and
- generating the output signal by performing a frequency-dividing operation in dependence on the generated signal and a dividing factor, wherein the dividing factor is determined in dependence on the control signal;
- wherein the frequency dividing operation is performed by a divider unit, and the divider unit comprises a noise shaper.
A method of tuning the frequency of a generated signal to form an output signal comprising:
- forming the generated signal at a signal generator;
- comparing a feedback signal with a reference signal and generating a control signal in dependence on that comparison, wherein the feedback signal is generated using the output signal;
- generating the output signal by performing a frequency-dividing operation in dependence on the generated signal and a dividing factor, wherein the dividing factor is determined in dependence on the control signal;
- generating the output signal by performing the frequency dividing operation to generate a frequency-divided signal;
- inputting the frequency-divided signal into a phase locked loop (PLL);
- and
- forming the output signal at a signal generator within the phase-locked loop;
- wherein the frequency-divided signal acts as the reference signal of the phase locked loop.
A method of tuning the frequency of a generated to form an output signal comprising:
- forming the generated signal at a signal generator;
- comparing a feedback signal with a reference signal and generating a control signal in dependence on that comparison, wherein the feedback signal is generated using the output signal;
- generating the output signal by performing a frequency-dividing operation in dependence on the generated signal and a dividing factor, wherein the dividing factor is determined in dependence on the control signal;
- and
- generating a plurality of output signals, wherein each of the said plurality of output signals is generated by performing a respective frequency dividing operation in dependence on the generated signal and a respective dividing factor.
An apparatus for frequency tuning a generated signal to form an output signal comprising:
- a signal generator arranged to output the generated signal;
- a comparison unit arranged to compare a feedback signal with a reference signal and further arranged to generate an error signal in dependence on the comparison, wherein the feedback signal is dependent upon the output signal;
- a frequency-divider unit arranged to perform a frequency dividing operation for generating the output signal in dependence on the generated signal and a dividing factor, wherein the dividing factor is dependent upon the error signal;
- and
- a plurality of frequency-divider units for generating a plurality of output signals, wherein each of the plurality of frequency-divider units is configured to perform a frequency-dividing operation for generating one of the said plurality of output signals in dependence on the generated signal and a respective dividing factor, where each of the respective dividing factors is dependent on the error signal.
Dependencies are inferred from the claim text.