Digital two-stage automatic gain control

Details Digital two-stage automatic gain control Digital two-stage automatic gain control

2003-02-06

2008-12-02

Corrielus, Jean B. (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

C375S130000, C375S142000, C375S239000, C375S316000, C375S340000

Reexamination Certificate

active

07460623

ABSTRACT:
A digital automatic gain control circuit is disclosed. The circuit includes a selector, a scaler, a detector, a gain adjustor and a controller. In one exemplary aspect, the selector receives an input signal having two components, namely, the in-phase (I) and quadrature (Q) components, in digital form. The selector then selects a subset of bits from each component based on a control signal provided by the controller. The two subsets are then forwarded to the scaler. The scaler then multiplies the two subsets respectively against a gain value to generate two multiplication results. A portion of each multiplication result is then provided as output by the scaler. The gain value and the subset selection are periodically adjusted in response to the scaler output. The adjustments with respect to the gain value and the subset selection are effectuated collectively by the detector, the gain adjustor and the controller.

REFERENCES:
patent: 6553084 (2003-04-01), Maru
patent: 6843597 (2005-01-01), Li et al.
patent: 6868263 (2005-03-01), Filipovic
patent: 7031409 (2006-04-01), Brobston et al.

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