Elimination of D.C. offset and spurious AM suppression in a dire

Details Elimination of D.C. offset and spurious AM suppression in a dire Elimination of D.C. offset and spurious AM suppression in a dire

1997-05-05

2000-09-05

Chin, Wellington

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455283, 375319, 375316, H04B 126, H03K 900, H04L 2506

Patent

active

061155934

ABSTRACT:
In a method for compensating D.C. offset in a direct conversion receiver by a signal (IF.sub.-- I, IF.sub.-- Q) received and demodulated in one of the channels of the reception frequency band of a radio communication system, a correction signal (Q.sub.control) is produced from the signals in the channels of the reception frequency band. The correction signal (Q.sub.control) is combined with the demodulated signal. The apparatus for implementing the method comprises means (12, 17, 18, 19) for producing the correction signal, and means (15, 16) for combining the correction signal with the received and demodulated signal.

REFERENCES:
patent: 4944025 (1990-07-01), Gehring et al.
patent: 5140699 (1992-08-01), Kozak
patent: 5212826 (1993-05-01), Rabe et al.
patent: 5263194 (1993-11-01), Ragan
patent: 5724653 (1998-03-01), Baker et al.
patent: 5838735 (1998-11-01), Khullar

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