Patent ID: 6980059
Filing Date: 2005-12-27
Classification: H03L,H04L

Abstract:
1. A data-directed frequency acquisition loop for synching to a signal, the data-directed frequency acquisition loop comprising: a VCO having an I and Q output; a first multiplier having as input the signal and the I and Q output, the first multiplier having an I′ and Q′ output; a second multiplier having as input the I′ and Q′ output and having an I″ and Q″ output; a first low-pass filter having as input the I″ output and having a filtered I″ output; a third multiplier having as input the filtered I″ output and the Q″ output and having a real output; and a second low-pass filter having as input the real output and having a feedback output that is input to the VCO.