Patent ID: 6606364
Filing Date: 2003-08-12
Classification: H03L

Abstract:
An apparatus for generating an output frequency signal that is synchronized with the clock rate of an input data signal that has a baud rate which may vary over a prescribed range, the prescribed range covering plural orders of magnitude of baud rate variation, comprising:a clock frequency generator; a variable divider, from which said output frequency signal is derived, and being operative to divide an output frequency signal generated by said clock frequency generator by a variable divisor and producing therefrom a divided clock signal having a frequency corresponding to said clock rate and which may fall anywhere within said prescribed range; a phase/frequency detector having a gain constant that is proportional to said variable divider, and including a first input coupled to receive said input data signal, a second input coupled to receive said divided clock signal produced by said variable divider, and an output representative of the phase/frequency difference between said input data signal and said divided clock signal; and a loop filter coupled in circuit with said phase/frequency detector and said clock frequency generator.