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:
Apr. 15, 1980
Filed:
Dec. 11, 1978
Applicant:
Inventors:
Joseph J Connolly, Jr, San Jose, CA (US);
Thomas M Fredericksen, San Jose, CA (US);
Thomas P Redfern, San Jose, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
3403 / ; 3403 / ;
Abstract
Two digital-to-analog converters are coupled in series across a reference potential source. Each converter includes a resistor ladder and switching tree that permits coupling the output to any single tap on the ladder. A digital word is split into two portions, each one of which operates one switching tree. The converters are weighted in accordance with the word bits applied. The switching tree outputs are combined to produce an analog output related to the reference potential and the digital word.