Adaptive timing using clock recovery

Details Adaptive timing using clock recovery Adaptive timing using clock recovery

2010-01-19

2011-12-13

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S375000

Reexamination Certificate

active

08077807

ABSTRACT:
Circuits and methods are provided for adjusting a frequency of a local clock signal in approximating a frequency of a host clock signal. A phase locked loop generates a local clock signal having a first phase and a first frequency. An offset adjustment circuit receives timing information relating the local clock signal to an incoming data signal and calculates a phase offset and a frequency offset indicative of adjustments to be made to the local clock signal. A first phase interpolator generates a receive clock signal from the local clock signal, the receive clock signal having a second phase and a second frequency responsive to the phase and frequency offsets. A second phase interpolator generates a transmit clock signal from the local clock signal having a third frequency responsive to the frequency offset.

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