Method and apparatus for high performance automatic frequency control in a wireless receiver

Abstract

An apparatus and a method are disclosed wherein a clock generator component converts a received clock signal into a plurality of internal clock signals which are skewed in time, a phase difference component computes phase differences at subsequent clock phases of a received phase signal, an intermediate averaging component receives each phase difference signals and outputs their average, a threshold detection component detects steady phase changes and activates a preamble detect signal which is used to clock an output filter that smoothes the output from the intermediate averaging component. The output is a frequency correction signal that is used by a wireless receiver to correct its reception process. The disclosed invention merges the frequency correction process more quickly and accurately, is less likely to trigger on noise and has a lower packet error rate than conventional systems.