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. 23, 2010
Filed:
Aug. 31, 2005
Robert M. Pailthorp, Portland, OR (US);
Brandon Mccurry, Portland, OR (US);
Robert M. Pailthorp, Portland, OR (US);
Brandon McCurry, Portland, OR (US);
Electro Scientific Industries, Inc., Portland, OR (US);
Abstract
Thermoelectric effects that occur during laser trimming of resistors () are resolved by taking voltage measurements. The voltage attributed to laser heating on a resistor () during a low-power simulated trim () is used to determine a relatively thermal-neutral location () on the resistor (). A trimming-to-value operation can then be performed on all like resistors (). Voltage measurements can also be taken before and after every pulse in a trimming operation to establish thermal deviation information that can be used to offset the desired trim value against which resistor measurement values are compared. Spatially distant or nonadjacent resistors () in a row or column can also be trimmed sequentially to minimize heating effects that might otherwise distort resistance values on adjacent or nearby resistors ().