A SIGNAL CLOCK RECOVERY CIRCUIT AND METHOD FOR MULTI-LEVEL MODULATED SIGNALS

摘要

PURPOSE: A symbol clock recovery circuit of a multi-level modulation signal and a method thereof are provided to overcome problems in early-late clock recovery and to simplify hardware by enabling a symbol clock recovery of a multi-level signal. CONSTITUTION: A signal input to a late sampler(11), an early sampler(13) and an on-time sampler(21) are output to a timing error detector(22). The output of the timing error detector(22) is input to a voltage control oscillator(17). The output of the voltage control oscillator(17) is input to an early-late-on-time clock generator(23). The output of the early-late-on-time clock generator(23) is input again to the late sampler(11), the early sampler(13) and the on-time sampler(21).