Phase interpolation based clock data recovery circuit and communication device including the same

Abstract

A clock data recovery circuit includes a phase locked loop (PLL), a code signal generator, and a clock and data generator. The PLL generates a plurality of reference clock signals of which frequencies are modulated. Each of the plurality of reference clock signals has a first profile that is periodically fluctuated. The code signal generator generates a first compensation code signal. The first compensation code signal has a second profile that is periodically fluctuated and is different from the first profile. The clock and data generator generates a recovered data signal by sampling an input data signal based on a clock signal, compensates a frequency modulation on the plurality of reference clock signals based on the first compensation code signal, and includes a phase interpolator that generates the clock signal based on the plurality of reference clock signals and the first compensation code signal.