Patent ID: 7724048
Filing Date: 2010-05-25
Classification: H03L

Abstract:
1. A circuit for receiving an input signal having a first frequency and generating an output signal having a second frequency, the circuit comprising: a forward branch for receiving the input signal and generating the output signal; and a return branch for generating a feedback signal from the output signal; wherein the forward branch comprises: a frequency detector for receiving the input signal and the feedback signal and outputting a value based on a ratio of a frequency of the feedback signal to the first frequency; a word length reduction block for receiving a fractional component of a first division factor and generating a modulated output; an adder for forming a sum of an integer component of the first division factor and the modulated output of the word length reduction block; a subtracting element for subtracting said output value of the frequency detector from said sum; and an oscillator controlled by an output from the subtracting element.