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:
May. 26, 2020
Filed:
Aug. 14, 2019
Ablic Inc., Chiba-shi, Chiba, JP;
Takashi Matsuda, Chiba, JP;
Fumihiko Maetani, Chiba, JP;
ABLIC INC., Chiba, JP;
Abstract
There is provided a constant current circuit having a current characteristic satisfactory in a high voltage circuit while being low in manufacturing cost. The constant current circuit includes a high breakdown-voltage depletion type NMOS transistor and a low breakdown-voltage depletion type NMOS transistor connected in series between a first terminal and a second terminal. The low breakdown-voltage depletion type NMOS transistor includes a first depletion type NMOS transistor and a second depletion type NMOS transistor connected in series. The high breakdown-voltage depletion type NMOS transistor has a gate connected to a connecting point of the first depletion type NMOS transistor and the second depletion type NMOS transistor.