Patent ID: 6934869

Claim:
A phase locked loop having a binary quantized phase detector, comprising: a first means for storing a reference threshold value; a comparator having a first input for receiving a first input signal and a second input for receiving the reference threshold value, the comparator comparing the first input signal with the reference threshold value to generate an output; and a set threshold block, comprising: a second means for generating a constant value for level shifting the output from the comparator to produce an output whose value is 0; and an integrator, coupled to the second means, for locating a cross point in a data-eye diagram of a data sequence, having an input for receiving the output from the comparator and an output for generating a new threshold value; a third means for filtering the output of the second means, having a first input for receiving the quantized output and an output coupled to the integrator; and a fourth means for determining if two values are not equal, having a first input for receiving a first input signal, a second input for receiving a second input signal, and an output coupled to a second input of the third means.