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:
Jun. 18, 2019
Filed:
May. 02, 2018
Fuji Electric Co., Ltd., Kawasaki-shi, Kanagawa, JP;
Masaru Saito, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-shi, Kanagawa, JP;
Abstract
In a constant voltage clamping circuit, a p-type anode region and an n-type pickup region are provided separated from each other in an n-type well region. In the p-type anode region, a p-type low-concentration anode region is provided. In the p-type low-concentration anode region, an n-type cathode region is provided. A first Zener diode of a highest potential of the constant voltage clamping circuit is formed by a pn junction of the p-type anode region, the p-type low-concentration anode region and the n-type cathode region. An n-type pickup contact region in the n-type pickup region is arranged at a position near the n-type cathode region and separated farther the n-type cathode region, from p-type anode contact region. The n-type pickup contact region and the p-type anode contact region are short-circuited.