DC offset correction for direct conversion receivers

Details DC offset correction for direct conversion receivers DC offset correction for direct conversion receivers

2006-06-14

2009-10-13

Nguyen, Lee (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S253200, C455S296000, C455S324000

Reexamination Certificate

active

07603094

ABSTRACT:
A direct current (DC) offset correction system for a direct conversion receiver and corresponding receiver and methods facilitate reduction of DC offsets in such receivers. One method includes 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 as supplied, e.g., by an AGC system; and 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.

REFERENCES:
patent: 6240100 (2001-05-01), Riordan et al.
patent: 2004/0146128 (2004-07-01), Cuje et al.
patent: 2006/0222117 (2006-10-01), Rahman et al.

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