Patent ID: 6791379
Filing Date: 2004-09-14
Classification: H03L

Abstract:
A phase lock loop for providing an output signal with a desired characteristic frequency that is an integer, N, multiple of a characteristic frequency of an input signal, said phase lock loop comprising:a voltage controlled oscillator generating one or more oscillator signals, wherein each of the one or more oscillator signals are associated with M phases of the desired characteristic frequency of the output signal; a phase detector for comparing a phase or the frequency characteristic of the input signal to a phase or frequency characteristic of a particular one of the one or more oscillator signals to the input signal; and a Gray code multiplexer for selecting a particular one of the one or more oscillator signals based on a Gray Code, said Gray code multiplexer further comprising: a first multiplexer receiving two of the one or more oscillator signals, wherein the two of the one or more oscillator signals have approximately a 180 degree phase shift with respect to each other; and a second multiplexer receiving another two of the one or more oscillator signals, wherein the another two of the one or more oscillator signals have approximately a 180 degree phase shift with respect to each other.