Various embodiments of the present invention provide systems and methods for gain control. For example, some embodiments of the present invention provide variable gain control circuits. Such circuits include a zero forcing loop generating a zero forcing feedback and a least mean square loop generating a least mean square feedback. An error quantization circuit generates a hybrid feedback based upon a threshold condition using the zero forcing feedback and the least mean square feedback. A variable gain amplifier is at least in part controlled by a derivative of the hybrid feedback.

Title
AGC Loop with Weighted Zero Forcing and LMS Error Sources and Methods for Using Such
Application Number
12/352540
Publication Number
20100177419
Application Date
January 12, 2009
Publication Date
July 15, 2010
Inventor
Yuan Xing Lee
San Jose
CA, US
George Mathew
San Jose
CA, US
Jongseung Park
Allentown
PA, US
Hongwei Song
Longmont
CO, US
Jingfeng Liu
Longmont
CO, US
Agent
Hamilton DeSanctis & Cha
CO, US
Assignee
LSI Corporation
IPC
H03G 03/30
G11B 05/00
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