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:
Nov. 06, 2001
Filed:
Nov. 22, 1999
Applicant:
Inventor:
Gary Brown, Fremont, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M 1/66 ; H04B 1/404 ;
U.S. Cl.
CPC ...
H03M 1/66 ; H04B 1/404 ;
Abstract
In a line driver that utilizes a digital-to-analog converter (DAC) to generate a current that is used to form an output voltage V,, variations in the output voltage V,are minimized by a calibration circuit that senses the output voltage V,, compares the output voltage V,to a reference voltage, and then increments or decrements the bias current fed into the DAC to match the output voltage V,to the reference voltage.