Patent ID: 7603094
Filing Date: 2009-10-13
Classification: H03D,H04B

Abstract:
1. A method of DC (direct current) offset correction in a direct conversion receiver, the method comprising: calibrating a DC offset correction system in a closed loop configuration over each of a plurality of gain settings to provide a plurality of offset data for an operating mode of the direct conversion receiver; selecting one of the plurality of offset data based on a current gain setting of the direct conversion receiver; operating the DC offset correction system in an open loop configuration using the one of the plurality of offset data to correct for a DC offset in the direct conversion receiver; and generating a plurality of coarse offset data by operating, during a coarse calibration procedure, the DC offset correction system and the direct conversion receiver in a closed loop configuration over a long time period in each of the plurality of gain settings and storing the plurality of coarse offset data that results in a memory and wherein the calibrating the DC offset correction system over each of the plurality of gain settings starts with coarse offset data corresponding to the each of the plurality of gain settings.