The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 1995
Filed:
Jul. 24, 1992
Jun Etoh, Hachioji, JP;
Masakazu Aoki, Tokorozawa, JP;
Masashi Horiguchi, Kawasaki, JP;
Shigeki Ueda, Hachioji, JP;
Hitoshi Tanaka, Tachikawa, JP;
Kazuhiko Kajigaya, Iruma, JP;
Tsugio Takahashi, Ome, JP;
Hiroshi Kawamoto, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi VLSI Engineering Corporation, Tokyo, JP;
Abstract
A voltage limiter circuit is disposed in a semiconductor IC chip in order to reduce an operating voltage of an internal circuit of a scaled-down element. A small capacitance of a Vcc wiring by the disposition constitutes a resonance circuit together with an inductance of the Vcc wiring. Resonance at the resonance circuit causes large variation of a supply current and noise. An additional capacitance is connected between the Vcc wiring and a Vss wiring in order to suppress the variation and noise. The capacitance is formed by a PN junction and is connected in series to a damping resistance.