PVT drift compensation
DCFirst Claim
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1. A timing circuit for generating a timing signal having a predetermined relationship with a reference signal, comprising:
- a locked loop for generating the timing signal, comparing the phase of the reference signal to the phase of the timing signal, and adjusting the phase of the timing signal based on such comparison; and
a PVT (Process-Voltage-Temperature) line operatively associated with the locked loop so that PVT drift in the PVT line counters PVT drift in the locked loop.
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Abstract
A timing circuit for generating a timing signal having a predetermined relationship with a reference signal. The timing circuit includes a locked loop for generating the recovered clock signal, comparing the phase of the reference signal to the phase of the timing signal, and adjusting the phase of the timing signal based on the comparison; and a PVT (Process-Voltage-Temperature) line operatively associated with the locked loop so that PVT drift in the PVT line counters PVT drift in the locked loop.
21 Citations
31 Claims
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1. A timing circuit for generating a timing signal having a predetermined relationship with a reference signal, comprising:
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a locked loop for generating the timing signal, comparing the phase of the reference signal to the phase of the timing signal, and adjusting the phase of the timing signal based on such comparison; and a PVT (Process-Voltage-Temperature) line operatively associated with the locked loop so that PVT drift in the PVT line counters PVT drift in the locked loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A clock recovery circuit for generating a recovered clock signal having a predetermined relationship with an incoming signal, comprising:
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means for generating the recovered clock signal, comparing the phase of the incoming signal to the phase of the recovered clock signal, and adjusting the phase of the recovered clock signal based on such comparison; and PVT (Process-Voltage-Temperature) drift means operatively associated with the means for generating so that PVT drift in the PVT drift means counters PVT drift in the means for generating. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An information-bearing medium having computer-readable information thereon, the computer-readable information being configured to actuate a circuit-forming apparatus to form a cell of an integrated circuit including a clock recovery circuit, the clock recovery circuit being operable to generate a recovered clock signal having a predetermined relationship with an incoming signal, the clock recovery circuit comprising:
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at least one locked loop for generating the recovered clock signal, comparing the phase of the incoming signal to the phase of the recovered clock signal, and adjusting the phase of the recovered clock signal based on such comparison; and at least one PVT (Process-Voltage-Temperature) line operatively associated with the locked loop so that PVT drift in the PVT line counters PVT drift in the locked loop. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of generating a recovered clock signal having a predetermined relationship with an incoming signal, the method comprising the steps of:
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generating the recovered clock signal; comparing the phase of the incoming signal to the phase of the recovered clock signal using a comparison circuit; adjusting the phase of the recovered clock signal based on the comparing; and compensating for PVT (process-voltage-temperature drift associated with the comparison circuit through use of a a PVT drift line.
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Specification