Trimmer impedance component, semiconductor device and...

Details Trimmer impedance component, semiconductor device and... Trimmer impedance component, semiconductor device and...

2007-04-17

2007-04-17

Hoang, Tu (Department: 2832)

Electrical resistors

Mechanically variable

Resistance value varied by removing or adding material

C338S203000

Reexamination Certificate

active

10994601

ABSTRACT:
A trimmer resistance component of the present invention has a trimmer resistor constructed of a p-type diffusion layer formed on the surface of an n-type epitaxial layer. A first electrode is connected to a portion located on one end side of this trimmer resistor, while a first connection portion, a second connection portion and a third connection portion of the second electrode are connected to portions located on the other end side. By cutting a portion of the first connection portion and a portion of the second connection portion by laser trimming, a resistance value between the first electrode and the second electrode can be trimmed without changing a parasitic capacitance between the trimmer resistor and the n-type epitaxial layer.

REFERENCES:
patent: 3959732 (1976-05-01), Schaefer
patent: 4150366 (1979-04-01), Price
patent: 4338590 (1982-07-01), Connolly et al.
patent: 4906966 (1990-03-01), Imamura et al.
patent: 5363084 (1994-11-01), Swinehart
patent: 5757264 (1998-05-01), Petit
patent: 9-331021 (1997-12-01), None
patent: 11-338560 (1999-12-01), None

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