Electric heating – Metal heating – By arc
Reexamination Certificate
2005-08-31
2010-02-23
Hoang, Tu B (Department: 3742)
Electric heating
Metal heating
By arc
C219S121680
Reexamination Certificate
active
07667159
ABSTRACT:
Thermoelectric effects that occur during laser trimming of resistors (20) are resolved by taking voltage measurements. The voltage attributed to laser heating on a resistor (20) during a low-power simulated trim (10) is used to determine a relatively thermal-neutral location (18) on the resistor (20). A trimming-to-value operation can then be performed on all like resistors (20). 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 (20) 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 (20).
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McCurry Brandon
Pailthorp Robert M.
Electro Scientific Industries Inc.
Hoang Tu B
Stoel Rives LLP
Tran Thien
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