Patent ID: 7514970
Filing Date: 2009-04-07
Classification: H03L

Abstract:
1. A frequency synthesizer, comprising: a clock synthesizer having a clock synthesis accumulator for accumulating a selected clock seed word with a clock frequency in a feedback signal path for synthesizing said clock frequency from a base reference frequency; an output synthesizer having an output synthesis accumulator for accumulating selected output seed words at the rate of said clock frequency in a forward signal path for synthesizing output frequencies, respectively, with frequency steps at exact decimal divisions of said base reference frequency; and wherein: the output synthesizer further includes a tracking filter including an output oscillator for providing a one of said output frequencies according to a phase comparison between a feedback signal derived from an output signal at said one of said output frequencies and a second reference signal derived from an MSB signal; and said output synthesis accumulator is constructed for accumulating, at said clock frequency, a one of said output seed words corresponding to said one of said output frequencies for updating an accumulation value having a most significant bit (MSB) for providing said MSB signal.