The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 1998
Filed:
Jan. 31, 1997
David Peter Swart, Pine Island, MN (US);
Gregory Scott Winn, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
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.