PHASE-FREQUENCY DETECTOR WITH HIGH JITTER TOLERANCE
First Claim
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1. An apparatus including a phase-frequency detector for use in detecting a clock signal associated with an incoming data signal, comprising:
- a data electrode to convey a binary data signal having a clock signal associated therewith;
a plurality of clock electrodes to convey a plurality of clock signals having a like plurality of mutually dissimilar clock signal phases;
phase detection circuitry coupled to said data electrode and said plurality of clock electrodes, and responsive to said binary data signal and said plurality of clock signals by providing first and second beat signals corresponding to first and second samples of one or more of said binary data signal and plurality of clock signals;
filter circuitry coupled to said phase detection circuitry and responsive to said first and second beat signals by providing corresponding first and second filtered signals; and
frequency detection circuitry coupled to said filter circuitry and responsive to said first and second filtered signals by providing a detection signal having a value indicative of a frequency difference between said binary data signal and at least one of said plurality of clock signals.
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Abstract
A phase-frequency detection system and method for enhancing performance of the frequency detector in a phase-frequency detection system. Filtering of the frequency detector inputs makes operation of the frequency detector more robust in the presence of intersymbol interference within the incoming data signal and other non-ideal characteristics such as noise and crosstalk.
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Citations
20 Claims
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1. An apparatus including a phase-frequency detector for use in detecting a clock signal associated with an incoming data signal, comprising:
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a data electrode to convey a binary data signal having a clock signal associated therewith; a plurality of clock electrodes to convey a plurality of clock signals having a like plurality of mutually dissimilar clock signal phases; phase detection circuitry coupled to said data electrode and said plurality of clock electrodes, and responsive to said binary data signal and said plurality of clock signals by providing first and second beat signals corresponding to first and second samples of one or more of said binary data signal and plurality of clock signals; filter circuitry coupled to said phase detection circuitry and responsive to said first and second beat signals by providing corresponding first and second filtered signals; and frequency detection circuitry coupled to said filter circuitry and responsive to said first and second filtered signals by providing a detection signal having a value indicative of a frequency difference between said binary data signal and at least one of said plurality of clock signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus including a phase-frequency detector for use in detecting a clock signal associated with an incoming data signal, comprising:
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phase detector means for detecting a binary data signal having a clock signal associated therewith and a plurality of clock signals having a like plurality of mutually dissimilar clock signal phases to provide first and second beat signals corresponding to first and second samples of one or more of said binary data signal and plurality of clock signals; filter means for filtering said first and second beat signals to provide corresponding first and second filtered signals; and frequency detector means for detecting said first and second filtered signals to provide a detection signal having a value indicative of a frequency difference between said binary data signal and at least one of said plurality of clock signals.
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12. A method of phase-frequency detection for use in detecting a clock signal associated with an incoming data signal, comprising:
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detecting a binary data signal having a clock signal associated therewith and a plurality of clock signals having a like plurality of mutually dissimilar clock signal phases to provide first and second beat signals corresponding to first and second samples of one or more of said binary data signal and plurality of clock signals; filtering said first and second beat signals to provide corresponding first and second filtered signals; and detecting said first and second filtered signals to provide a detection signal having a value indicative of a frequency difference between said binary data signal and at least one of said plurality of clock signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification