DC offset correcting in a direct conversion or very low IF...

Details DC offset correcting in a direct conversion or very low IF... DC offset correcting in a direct conversion or very low IF...

2006-11-14

2006-11-14

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Receivers

Automatic baseline or threshold adjustment

Reexamination Certificate

active

07136431

ABSTRACT:
A direct conversion or VLIF receiver corrects DC offset by, prior to receiving a burst of data, the receiver determines a coarse DC offset with the antenna of the receiver switched off. The receiver then adjusts an analog portion of the receiver (e.g., the output of the mixers) based on the coarse DC offset. The receiver then determines a gain setting of the receiver (e.g., for the low noise amplifier and/or programmable gain amplifiers) with the antenna on. The receiver then sets the gain of at least one gain stage of the receiver based on the gain setting. The receiver then determines a fine DC offset with the antenna off. The receiver then, while receiving a burst of data, subtracts the fine DC offset from the digital baseband or low IF signal prior to data recovery.

REFERENCES:
patent: 6445736 (2002-09-01), Wheeler
patent: 6882208 (2005-04-01), Suissa et al.
patent: 2003/0174641 (2003-09-01), Rahman
patent: 2003/0203728 (2003-10-01), Filipovic
patent: 2004/0043744 (2004-03-01), Schlegel et al.

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