Patent ID: 9577815
Date: 2017-02-21
CPC Classifications: H04L

Claim:
1. An apparatus comprising: a phase interpolator configured to operate on a pair of local oscillator feedback signals and an independent phase measurement made on a sampled non-skewed reference signal and to responsively generate a phase offset feedback signal having a phase offset corresponding to an estimated skew error; a phase comparator configured to receive a skewed reference signal having an associated skew error and the phase offset feedback signal, and to generate an oscillator adjustment signal representing in part a difference between the estimated skew error and the associated skew error; a local oscillator configured to receive the oscillator adjustment signal and to responsively generate a plurality of phased sampling clocks, wherein two of the phased sampling clocks correspond to the pair of local oscillator feedback signals; a comparator configured to slice the sampled non-skewed reference signal against a reference level and to provide a digital result; and, an early-late logic circuit configured to receive the digital result and to responsively generate the independent phase measurement.