Fully digital AGC circuit with wide dynamic range and method...

Details Fully digital AGC circuit with wide dynamic range and method... Fully digital AGC circuit with wide dynamic range and method...

2006-04-18

2006-04-18

Phu, Phuong (Department: 2631)

Pulse or digital communications

Receivers

Automatic gain control

C455S234100, C455S240100

Reexamination Certificate

active

07031409

ABSTRACT:
A digital automatic gain control (AGC) circuit for use in a radio frequency (RF) receiver. The AGC circuit comprises: 1) a first shifter for receiving an in-phase signal as a first series of X-bit samples and left-shifting each X-bit sample by a number of bits determined by a coarse scaling factor; 2) a first limiter for receiving the D most significant bits of the output of the first shifter and outputting a subset of the D most significant bits of the first shifter output; 3) a first multiplier for multiplying the subset of the D most significant bits of the first shifter output by a fine scaling factor to produce a first M-bit product; and 4) a gain adjustment circuit for comparing a power signal derived from the first M-bit product to a maximum threshold value and generating the coarse scaling factor and the fine scaling factor.

REFERENCES:
patent: 5764689 (1998-06-01), Walley
patent: 6249554 (2001-06-01), Mobin et al.
patent: 6275259 (2001-08-01), Gowda et al.
patent: 6553084 (2003-04-01), Maru
patent: 6843597 (2005-01-01), Li et al.
patent: 6868263 (2005-03-01), Filipovic
patent: 2003/0148745 (2003-08-01), Nystrom et al.
patent: 2003/0207675 (2003-11-01), Hughes et al.
patent: 2004/0014441 (2004-01-01), Piirainen et al.

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