Digital phase-locked loop
AssigneeAdvanced Micro Devices, Inc.
InventorsSanjeev MAHESHWARI, Emerson FANG
Life of this patent
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Abstract
Apparatus, systems and methods are provided for digital phase-locked loops. A digital phase-locked loop comprises an oscillator module configured to generate an output signal and a phase detection module coupled to the oscillator module. The phase detection module is configured to signal the oscillator module to adjust a frequency of the output signal by a first amount when a phase difference between a reference signal and the output signal is less than a threshold amount, and signal the oscillator module to adjust the frequency by a greater amount when the phase difference is greater than the threshold amount.
Claims20
A digital phase-locked loop comprising:
- an oscillator module configured to generate a first signal;
- and
- a phase detection module coupled to the oscillator module, wherein the phase detection module is configured to:
- signal the oscillator module to adjust a frequency of the first signal by a first amount when a phase difference between a reference signal and the first signal is less than a threshold amount;
- and
- signal the oscillator module to adjust the frequency by a second amount when the phase difference is greater than the threshold amount, the second amount being greater than the first amount.
A computing module comprising:
- circuitry configured to communicate data over a serial interface;
- and
- a digital phase-locked loop coupled to the circuitry, the digital phase-locked loop being configured to provide an output signal to the circuitry for communicating the data in sync with the output signal, wherein the digital phase-locked loop is configured to:
- adjust a frequency of the output signal by a first amount when a phase difference between a reference signal and the output signal is less than a threshold amount;
- and
- adjust a frequency of the output signal by a second amount when a phase difference between the reference signal and the output signal is greater than the threshold amount, the second amount being greater than the first amount.
A method for generating an output signal having a frequency using a digital phase-locked loop, the method comprising:
- adjusting, by the digital phase-locked loop, the frequency of the output signal by a first amount when a phase difference between an input signal and the output signal is less than a threshold amount;
- and
- adjusting, by the digital phase-locked loop, the frequency of the output signal by a second amount when a phase difference between the input signal and the output signal is greater than the threshold amount, the second amount being greater than the first amount.
Dependencies are inferred from the claim text.