Patent ID: 9590640
Date: 2017-03-07
CPC Classifications: H03K,H03L,H04L

Claim:
1. An electronic apparatus comprising: an oscillator, generating a reference clock signal and an auxiliary dock signal offset by 90 degrees and having transition edges, wherein one of the transition edges is a data-sampling edge; a sampler, sampling an input data signal at each of the transition edges to generate a plurality of primary sampled signals; a phase detector, determining a phase difference of a data transition of the input data signal relative to the reference clock signal by comparing each of the primary sampled signals with the data-sampling edge; a phase rotator, rotating the primary sampled signals and the reference clock signal according to the phase difference such that the phase detector receives the rotated primary sampled signals and the rotated reference clock signal; and a loop filter, generating a control voltage to the oscillator to vary phases of the reference clock signal and the auxiliary clock signal according to phase difference of the data transition relative to the rotated reference clock signal.