Method and apparatus for trim adjustment of variable gain amplif

Details Method and apparatus for trim adjustment of variable gain amplif Method and apparatus for trim adjustment of variable gain amplif

1997-01-31

1998-10-13

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 360 46, 360 67, H03F 345, G11B 500

Patent

active

058218106

ABSTRACT:
An improved method and apparatus are provided for dc offset trim adjustment of a variable gain amplifier. The VGA has predetermined overall gain endpoints. A minimum gain and a maximum gain are identified for the VGA in a preferred operational range. The identified minimum gain and the identified maximum gain for the VGA in the preferred operational range are spaced apart inwardly from the VGA predetermined overall gain endpoints. The minimum gain for the VGA in operation is set, then trim adjustment of the VGA is provided to minimize an output of the VGA. Then the maximum gain for the VGA in operation is set, then dc offset trim adjustment of the VGA is provided to minimize an output of the VGA.

REFERENCES:
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patent: 5115409 (1992-05-01), Stepp
patent: 5379457 (1995-01-01), Nguyen
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patent: 5432475 (1995-07-01), Fukahori
patent: 5442492 (1995-08-01), Cunningham et al.
patent: 5514950 (1996-05-01), Sevenhans et al.
patent: 5515014 (1996-05-01), Troutman
patent: 5521545 (1996-05-01), Terry et al.
"Improved DC Offset Trim Scheme For Gilbert Cell Variable Gain AMPL", IBM R0896-0026 Atty: Karuna Ojanen, Esquire Date May 30, 1996 Patentec: 5643.

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