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:
Feb. 19, 1991
Filed:
Nov. 06, 1989
Applicant:
Inventors:
William F Davis, Tempe, AZ (US);
Richard T Ida, Chandler, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ; G01R / ;
U.S. Cl.
CPC ...
3241 / ; 3241 / ; 324 731 ; 437-8 ;
Abstract
A method to extract at wafer probe the variation of lateral PNP basewidth of transistors formed in an integrated circuit which uses two lateral PNP devices having different and known basewidths before fabrication of the devices in the integrated circuit and then measuring the ratio of the saturation currents at wafer probe. The actual basewidth of the lateral PNP transistor is then related to the difference of the known basewidths of the two lateral PNP transistors and the ratio of the saturation measured currents thereof.