Method and system for clock recovery with adaptive loop gain control

摘要

A method for phase recovery in a system that includes a clock recovery unit and an estimation unit. The clock recovery unit of the system has a first phase detector unit. The estimation unit has a second phase detector unit and it is configured to estimate a gain of the second phase detector unit. The estimation unit and the clock recovery unit are configured to operate in parallel.

主权项

1. A system, comprising:
a clock recovery unit having a gain adjustment unit, a first phase detector unit, a filter and a numerically controlled oscillator coupled in a closed loop, wherein an output of the first phase detector unit is coupled to the filter, an output of the filter is coupled to the numerically controlled oscillator, and wherein a signal provided by the output of the filter controls the numerically controlled oscillator based on a signal provided by the output of the first phase detector unit; an estimation unit having a second phase detector unit and a gain estimation unit coupled in series, said gain estimation unit being configured to estimate a gain of said second phase detector unit; wherein the estimated gain of said second phase detector unit includes a variable part; and wherein said estimation unit and said clock recovery unit are configured to operate in parallel, wherein the clock recovery unit is coupled to an output of the estimation unit, and the gain adjustment unit of the clock recovery unit is adapted to adaptively adjust loop gain of the closed control loop including the first phase detector unit based on the estimated gain of the second phase detector unit to achieve a constant loop gain.