Phase-lock loop
AssigneeInfineon Technologies AG
InventorsChin Yeong Koh, Kar Ming Yong
Life of this patent
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Abstract
In one implementation an output signal of an oscillator is varied to be within a desired frequency band with respect to a reference signal, the output signal having a plurality of phases. The implementation may include comparing the output signal with the reference signal, counting falling edges about each phase of the number of phases in a predetermined time period and summing to define a count output; comparing the count output with a product of the number of phases of the output signal and the factor to define a comparison, generating a control signal based upon the comparison, and inputting the control signal to the oscillator to alter the output signal thereof.
Claims16
A method of varying an output signal of an oscillator to be within a desired frequency band with respect to a reference signal, the output signal having a plurality of phases, the method comprising:
- detecting at least one falling edge of the output signal;
- increasing a count for each falling edge detected;
- detecting a falling edge of the reference signal;
- defining a count summation based on the count for each falling edge detected;
- defining a comparison signal based on at least the count summation;
- outputting the comparison signal to a loop filter;
- generating a control signal by the loop filter based upon the comparison signal;
- and
- inputting the control signal to the oscillator, the control signal altering the output signal of the oscillator.
A phase-lock loop, comprising:
- an oscillator to receive a control signal and generate an output signal having a plurality of phases;
- a frequency detector coupled to receive the output signal of the oscillator, the frequency detector configured to:
- detect at least one falling edge of the output signal;
- increase a count for each falling edge detected;
- detect a falling edge of a reference signal associated with the frequency detector;
- sum the count for each phase of the plurality of phases, defining a count summation;
- and
- compare the count summation with a product of a number of phases of the output signal and a factor, defining a comparison signal;
- and
- a loop filter coupled to receive the comparison signal and configured to generate the control signal based upon the comparison signal, with the control signal altering the output signal.
A method, comprising:
- comparing an output signal with a reference signal, the comparing comprising:
- counting falling edges associated with the output signal in a predetermined time period and summing to define a count output;
- comparing the count output with a product and a factor to define a comparison;
- generating a control signal based upon the comparison;
- and
- inputting the control signal to an oscillator.
Dependencies are inferred from the claim text.