Phase interpolator control circuit

• Main Authors: ZHANG BING, CHEN HUINING
• Format: Patent
• Language: English
• Published: 29.07.2015
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; PULSE TECHNIQUE

The invention discloses a phase interpolator control circuit. Input high-speed serial data is sampled through an input sampler, a phase detector module detects data bit and edge information and determines a phase relation (advanced or lagged) between a sampling clock and data, phase coarse adjusting is performed by use of the phase relation, a phase interval is selected, at the same time, through fine adjusting, phase interpolation is carried out according to weight information in the phase interval, and if an interpolation is at the edge of the phase interval, only one edge of the interval is changed and a weight factor is adjusted towards an opposite direction, such that it is ensured that phase adjustment is continuously changed. The phase interpolator control circuit provided by the invention enables the phase adjustment of the sampling clock to be continuously changed in the phase interval and between adjacent phase intervals, does not generate phase abrupt change when the sampling clock spans the phase interval, and can effectively reduce jittering of the clock and the data.