Compensation for digitally controlled oscillator apparatus and method
AssigneeIntel Corporation
InventorShenggao Li
Life of this patent
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Abstract
Automatic digital sensing and compensation of frequency drift caused by temperature, aging, and/or other effects may be provided by including a compensation capacitor array and a sensing logic. The sensing logic may be configured to detect a drift in a first control signal and to provide the compensation capacitor array with a second control signal. The second control signal is configured to cause an adjustment of capacitance in the compensation capacitor array based on the detected drift in the first control signal.
Claims20
A digitally controlled oscillator (DCO) circuit comprising:
- a first capacitor array to receive a first control signal to control a first capacitance of the first capacitor array, wherein the first capacitor array is to provide fine frequency tuning for the DCO circuit;
- a second capacitor array to receive a second control signal to control a second capacitance of the second capacitor array;
- a third capacitor array to provide coarse frequency tuning for the DCO circuit;
- and
- a sensing logic coupled to the first capacitor array and the second capacitor array, the sensing logic to:
- detect a drift in the first control signal;
- and
- adjust the second control signal based on the detected drift.
A digital phase-locked loop (PLL) circuit comprising:
- a fine tuning capacitor array to provide fine-tuning of an output frequency of the PLL circuit responsive to a first control word;
- a compensation capacitor array to compensate for temperature drift or aging of the PLL circuit based on the first control word;
- and
- a third capacitor array to provide coarse tuning of the output frequency of the PLL circuit.
A computer system comprising:
- a processor;
- and
- a communication interface coupled to the processor, the communication interface including a digitally controlled oscillator (DCO) having:
- a fine tuning capacitor array to provide fine-tuning of an output frequency of the DCO responsive to a fine control word;
- a compensation capacitor array;
- sensing logic to detect a drift of the fine control word and control a capacitance of the compensation capacitor array based on the detected drift;
- and
- digital loop filter logic coupled to the sensing logic to indicate a phase difference between a feedback signal and a reference clock signal to the sensing logic, wherein the sensing logic is to set a value of the fine control word based on the phase difference.
A digitally controlled oscillator (DCO) circuit comprising:
- a first capacitor array to receive a first control signal to control a first capacitance of the first capacitor array;
- a second capacitor array to receive a second control signal to control a second capacitance of the second capacitor array;
- and
- a sensing logic coupled to the first capacitor array and the second capacitor array, wherein the sensing logic is included in a digital loop filter, and wherein the sensing logic is to:
- detect a drift in the first control signal;
- and
- adjust the second control signal based on the detected drift.
A digitally controlled oscillator (DCO) circuit comprising:
- a first capacitor array to receive a first control signal to control a first capacitance of the first capacitor array;
- a second capacitor array to receive a second control signal to control a second capacitance of the second capacitor array, wherein the second capacitor array has a same capacitor configuration as the first capacitor array;
- and
- a sensing logic coupled to the first capacitor array and the second capacitor array, the sensing logic to:
- detect a drift in the first control signal;
- and
- adjust the second control signal based on the detected drift.
Dependencies are inferred from the claim text.