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

Pulse or digital communications – Receivers – Automatic gain control

Reexamination Certificate

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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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