Resistance circuit, and voltage detection and constant...

Details Resistance circuit, and voltage detection and constant... Resistance circuit, and voltage detection and constant...

2007-11-06

2007-11-06

Lee, K. Richard (Department: 2832)

Electrical resistors

Mechanically variable

Resistance value varied by removing or adding material

C338S254000, C338S320000

Reexamination Certificate

active

11529179

ABSTRACT:
A resistance circuit included in a semiconductor apparatus, which is formed of a plurality of thin film metal resistors connected in series, capable of achieving a precise resistance adjustment over a wide range by disconnecting or changing the resistors by laser beam irradiation. With three thin film metal resistors R1,R2,and R3connected in series, for example, each having resistance adjustable ranges ΔR1,ΔR2,and ΔR3,resistance adjustment accuracies R1_step, R2_step, and R3_step, and the total resistance adjustable range ΔR0specified by the relation ΔR0=ΔR1+ΔR2+ΔR3,the resistance circuit is formed to satisfy relational expressions, R1_step≦ΔR2,R2_step≦ΔR3,and R3_step≦0.001×ΔR0<R2_step≦0.01×ΔR0<R1_step≦0.1×ΔR0.This resistance circuit is suitably incorporated into high precision constant voltage generating, and voltage detecting circuits.

REFERENCES:
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patent: 8-124729 (1996-05-01), None
patent: 2003-37179 (2003-02-01), None

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