Staggered AGC with digitally controlled VGA

Details Staggered AGC with digitally controlled VGA Staggered AGC with digitally controlled VGA

2003-09-12

2008-10-07

Ghayour, Mohammad (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

C375S316000, C375S317000, C455S232100, C455S234100, C455S234200, C455S235100, C455S245200

Reexamination Certificate

active

07433431

ABSTRACT:
A method of and device for automatic gain control (AGC) incorporates digitally controlled variable gain amplifiers (VGAs). An AGC circuit comprises multiple AGC stages, where each of the stages comprises: respective I and Q VGAs; a detector for detecting respective I and Q output signals received from the respective I and Q VGAs; an analogue to digital converter for converting the detected I and Q output signals; and a digital engine for adjusting the respective I and Q VGAs for differences between the detected I and Q output signals and a reference signal. Using staggered AGCs incorporating respective I and Q VGAs splits the total dynamic range between n stages, allowing for reduced gain requirements in the VGAs. Using digital control for setting the VGA gains reduces analogue variations and I/Q gain imbalances. Using multiple update rates or magnitudes in the VGA control improves dynamic settling time.

REFERENCES:
patent: 4531089 (1985-07-01), Ishizuka et al.
patent: 5014056 (1991-05-01), Moriwaki
patent: 5043999 (1991-08-01), Aimer et al.
patent: 5680075 (1997-10-01), Sacca
patent: 5828955 (1998-10-01), Lipowski et al.
patent: 6163685 (2000-12-01), Dilling et al.
patent: 6308155 (2001-10-01), Kingsbury et al.
patent: 6590528 (2003-07-01), DeWulf
patent: 6792254 (2004-09-01), Constantinidis et al.
patent: 6892060 (2005-05-01), Zheng
patent: 6977976 (2005-12-01), Birkett et al.
patent: 7110734 (2006-09-01), Mohindra
patent: 7145934 (2006-12-01), Liang
patent: 2003/0156668 (2003-08-01), Atkinson et al.
patent: 2004/0002323 (2004-01-01), Zheng
patent: 2004/0203472 (2004-10-01), Chien
patent: 0 413 311 (1991-02-01), None
patent: 1 191 686 (2002-03-01), None
patent: WO 00/31867 (2000-06-01), None
patent: WO 01/15317 (2001-03-01), None
International Search Report for PCT/CA2004/001566 dated Dec. 24, 2004.

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