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US 2015/0312019 A1Published application
Clock and Data Recovery Using Receiver Clock Spread Spectrum Modulation and Offset Compensation
AssigneeRambus Inc.
InventorsHae-Chang Lee, Thomas H. Greer, III, Jade M. Kizer, Brian S. Leibowitz, Mark A. Horowitz
Life of this patent
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Abstract
A system and method for performing clock and data recovery. The system sets the phase of a recovered clock signal according to at least three estimates of the rate of change of an offset between the frequency of the data transmitter clock and the frequency of a receiver clock.
Claims20
A device, comprising:
- sampling circuitry configured to sample a signal arriving at the device according to a recovered clock, wherein the signal arriving at the device has a time-varying frequency;
- frequency information circuitry to record, in memory of the device, three or more distinct digital values, corresponding to frequency offsets, or rates of change of frequency offsets, between the arriving signal and a recovered clock generated by the device, during three or more distinct segments of a modulation period;
- and
- clock generation circuitry configured to generate the recovered clock, the clock generation circuitry including circuitry to adjust a frequency or phase of the recovered clock at distinct times in accordance with the recorded distinct digital values.
1 more element
A device, comprising:
- sampling circuitry configured to sample a signal arriving at the device according to a recovered clock, wherein the signal arriving at the device has a time-varying frequency;
- means for recording, in memory of the device, three or more distinct digital values, corresponding to frequency offsets, or rates of change of frequency offsets, between the arriving signal and a recovered clock generated by the device, during three or more distinct segments of a modulation period;
- and
- clock generation circuitry configured to generate the recovered clock, the clock generation circuitry including circuitry to adjust a frequency or phase of the recovered clock at distinct times in accordance with the recorded distinct digital values.
1 more element
A clock recovery method, comprising:
- sampling a signal arriving at a device according to a recovered clock, wherein the signal arriving at the device has a time-varying frequency;
- recording, in memory of the device, three or more distinct digital values, corresponding to frequency offsets, or rates of change of frequency offsets, between the arriving signal and a recovered clock generated by the device, during three or more distinct segments of a modulation period;
- and
- generating the recovered clock using circuitry to adjust a frequency or phase of the recovered clock at distinct times in accordance with the recorded distinct digital values.
1 more element
Dependencies are inferred from the claim text.