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:
Dec. 12, 1989
Filed:
Jul. 03, 1989
Bernard W Boland, Scottsdale, AZ (US);
William E Gandy, Jr, Phoenix, AZ (US);
Kevin B Jackson, Scottsdale, AZ (US);
Motorola Inc., Schamuburg, IL (US);
Abstract
An improved monolithic, temperature compensated voltage- reference diode is realized by creating a tub of epitaxial semiconductor material in a substrate of opposite conductivity type and creating a voltage reference junction at a surface of the tub. The junction between the tub and the substrate forms the forward-biased, temperature compensating junction of the device. The dopant concentration is varied during growth of the epitaxial material to provide a relatively low resistivity at the voltage-reference junction and a higher resistivity at the temperature compensating junction. The method described offers significant improvement over prior methods of manufacturing such devices in the area of cost and reliability.