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:
Apr. 20, 2010
Filed:
Jan. 09, 2009
Xingbi Chen, Chengdu, CN;
Xingbi Chen, Chengdu, CN;
University of Electronic Science and Technology, Chengdu, Sichuan, CN;
Abstract
In a chip containing high-voltage device with a semiconductor substrate of a first conductivity type, a method of implementing low-voltage power supply is provided, wherein the electrical potential of an isolated region of a second conductivity type in a surface portion is used as one output terminal or as a voltage by which a transistor is controlled to provide output current for a low-voltage power supply. The other output terminal could be either terminal of the two that apply high voltage to high-voltage device or could be a floating terminal. Using this method, a low-voltage power supply can be implemented not only for the low-voltage integrated circuit (I) in a power IC containing one high-voltage device, but also for the low-voltage integrated circuit in a power IC having totem-pole connection or CMOS connection. As there is no need to implement depletion mode device in the chip, the fabrication cost is reduced.