Apparatus and method for calibrating timing mismatch of edge rotator operating on multiple phases of oscillator

摘要

An exemplary calibration apparatus for calibrating timing mismatch of an edge rotator operating on multiple phases of an oscillator includes a capturing block arranged to capture phase error samples, and a calibrating block arranged to adjust timing of said edge rotator according to said phase error samples. An exemplary calibration method for calibrating timing mismatch of an edge rotator operating on multiple phases of an oscillator includes the following steps: capturing phase error samples, and adjusting timing of said edge rotator according to said phase error samples.

主权项

1. A calibration apparatus for calibrating timing mismatch of an edge rotator operating on multiple phases of an oscillator, comprising:
a capturing block, arranged to capture phase error samples; and a calibrating block, arranged to adjust timing of said edge rotator according to said phase error samples; wherein said phase error samples are derived from a reference phase and a variable phase corresponding to an output of said edge rotator; and wherein said reference phase is derived from a channel frequency command word (FCW) and a clock reference fed into a digital phase detector, and a fractional part of an FCW value is an inverse of a period of said edge rotator.