Electrical resistors – Mechanically variable – Resistance value varied by removing or adding material
Reexamination Certificate
2005-09-20
2009-10-06
Lee, Kyung (Department: 2832)
Electrical resistors
Mechanically variable
Resistance value varied by removing or adding material
C338S309000, C338S320000, C029S610100
Reexamination Certificate
active
07598841
ABSTRACT:
A thin film resistor (5) of an integrated circuit comprises an elongate resistive film (7) extending between electrical contact pads (10,11). A low impedance element (20) overlays and is electrically coupled to a portion of the resistive film (7) in an intermediate portion (22) thereof adjacent a second side edge (17) of the resistive film (7) for conducting current in parallel with the intermediate portion (22), and for reducing current density in the intermediate portion (22). First and second transverse edges (28,29) formed by spaced apart first and second slots (26,27) which extend from a first side edge (16) into the resistive film (7) define with a first side edge (16) of the resistive film (7) and the low impedance element (20) first and second trimmable areas (30,31) in the intermediate portion (22). Coarse trimming of the thin film resistor (5) is carried out by progressively extending a first trimming slot (34) into the first trimmable area (30) from the first transverse edge (28), and fine trimming is carried out by extending a second trimming slot (35) into the second trimmable area (31) from the second transverse edge (29).
REFERENCES:
patent: 3928837 (1975-12-01), Esper et al.
patent: 3995249 (1976-11-01), Ferry
patent: 4196411 (1980-04-01), Kaufman
patent: 4286249 (1981-08-01), Lewis et al.
patent: 4298856 (1981-11-01), Schuchardt
patent: 4505032 (1985-03-01), Praria
patent: 4682143 (1987-07-01), Chu et al.
patent: 4862136 (1989-08-01), Birkner
patent: 4999731 (1991-03-01), Bender et al.
patent: 5015989 (1991-05-01), Wohlfarth et al.
patent: 5268651 (1993-12-01), Kerth
patent: 5309136 (1994-05-01), Rezgui et al.
patent: 5601367 (1997-02-01), Nara
patent: 5640137 (1997-06-01), Mantha
patent: 5872504 (1999-02-01), Greitschus et al.
patent: 5929746 (1999-07-01), Edwards, Jr. et al.
patent: 6084502 (2000-07-01), Ariga et al.
patent: 6304167 (2001-10-01), Nakayama
patent: 6452519 (2002-09-01), Swanson
patent: 6489881 (2002-12-01), Aleksandravicius et al.
patent: 6667683 (2003-12-01), Emili et al.
patent: 2054721 (1970-11-01), None
patent: 1011110 (1998-07-01), None
patent: 0955678 (1999-11-01), None
patent: 1093132 (2000-07-01), None
patent: 6084621 (1994-03-01), None
patent: 10032110 (1998-02-01), None
International Search Report and written opinion—PCT/IE2006/000100, Dec. 4, 2006.
McGuinness Patrick M.
Stenson Bernard P.
Analog Devices Inc.
Lee Kyung
Wolf Greenfield & Sacks P.C.
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