Patent ID: 7773962
Filing Date: 2010-08-10
Classification: H03J,H03L

Abstract:
1. A method comprising: obtaining an estimate of a frequency offset between a received signal and a locally generated signal; after obtaining said frequency offset estimate, using a local fractional-N synthesizer to correct the frequency of the locally generated signal by changing a fractional multiplication value used by the local fractional-N synthesizer based on said frequency offset estimate, said local fractional-N synthesizer being fed by a local voltage controlled oscillator (VCO); and transferring some of said correction of said frequency of said locally generated signal from said local fractional-N synthesizer to said local VCO, wherein transferring some of said correction includes changing the fractional multiplication value of said local fractional-N synthesizer in a manner that changes the frequency of the locally generated signal by a first amount and changing an input to said local VCO in a manner that changes the frequency of the locally generated signal by a negative of said first amount.