Capacitor having adjustable capacitance, and printed wiring...

Semiconductor device manufacturing: process – Making passive device – Trench capacitor

Reexamination Certificate

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C438S386000, C438S398000, C438S399000, C361S292000, C361S298200, C361S299400, C361S303000, C257S303000, C257S306000, C257S309000, C257SE21008, C257SE21013

Reexamination Certificate

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07662694

ABSTRACT:
The capacitance of a capacitor is adjusted by forming openings in one of a pair of electrodes of the capacitor, the openings having different sizes d1, d2, d3, . . . , wherein d1>d2>d3> . . . and being arranged in numbers n1, n2, n3, . . . , respectively; and sequentially filling a necessary number of the openings with an electroconductive material in descending order of the size so as to adjust the capacitance gradually with an increasing degree of precision. The resulting capacitor is mounted to a printed wiring board.

REFERENCES:
patent: 5164881 (1992-11-01), Ahn
patent: 6375823 (2002-04-01), Matsuda et al.
patent: 10-303062 (1998-11-01), None
patent: 2000-232078 (2000-08-01), None
patent: 2000-340454 (2000-12-01), None

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