Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode
Reexamination Certificate
2006-05-12
2009-11-10
Menz, Douglas M (Department: 2891)
Active solid-state devices (e.g., transistors, solid-state diode
Field effect device
Having insulated electrode
C257S379000, C257SE29003
Reexamination Certificate
active
07615824
ABSTRACT:
D/A conversion having higher accuracy is provided by improving relative accuracy of the resistance value of resistors which configure a resistor string. A manufacturing method of a D/A converter circuit of the invention comprises the steps of: forming a resistor string11which includes a plurality of resistors R0to R7connected in series with each other between reference voltages, and a plurality of switching elements S0to S3connected with each connection node of the resistors R0to R7, wherein: each of the resistors R0to R7is a thin film element crystallized by linear laser irradiation; disposing all forming parts of the resistors configuring the resistor string11within a laser irradiation area19; and crystallizing all the forming parts of the resistors which are disposed within the laser irradiation area with the same laser shot.
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Search Report (European Application No. 04008875.9) Dated Sep. 1, 2008.
Koyama Jun
Miyake Hiroyuki
Miyata Kazuhiko
Takahashi Kei
Menz Douglas M
Robinson Eric J.
Robinson Intellectual Property Law Office P.C.
Semiconductor Energy Laboratory Co,. Ltd.
Sharp Kabushiki Kaisha
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