Patent ID: 6700944
Filing Date: 2004-03-02
Classification: H03D

Abstract:
A phase detector for outputting a variable width pulse indicative of phase difference and a reference pulse as phase detector outputs, comprising:(a) means for frequency dividing an input data signal, said dividing means providing at a data output a frequency divided data signal corresponding to said input data signal; (b) a second data latch, said second data latch comprising a clock input coupled to a clock signal selected from the group consisting of a first clock signal and an inverted first clock signal, a data input coupled to an output of said means for frequency dividing, and a data output; (c) a first exclusive OR gate, comprising a first and second inputs and an output, said first and second inputs coupled to said data output of said dividing means and said data output of said second data latch, respectively, said first exclusive OR gate providing said variable width pulse at said output; (d) a third data latch, said third data latch comprising a clock input coupled to said clock signal, a data input coupled to said second data latch data output, and a data output; and (e) a second exclusive OR gate, comprising a first and second inputs and an output, said first and second inputs coupled to said data outputs of said second and third data latches, respectively, said second exclusive OR gate providing said reference pulse at said output.