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:
Sep. 14, 2021
Filed:
Mar. 24, 2020
Applicant:
Hitachi, Ltd., Tokyo, JP;
Inventors:
Shinya Kajiyama, Tokyo, JP;
Tadahiro Nabeta, Tokyo, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/45 (2006.01); H03F 1/52 (2006.01);
U.S. Cl.
CPC ...
H03F 3/4508 (2013.01); H03F 1/52 (2013.01); H03F 2200/444 (2013.01); H03F 2203/45314 (2013.01);
Abstract
An amplifier circuit includes a potential relation between a common emitter amplifier circuit (amplifier circuit body) including an NPN transistor (bipolar transistor) and a clamp circuit which maintains a potential relation between a base-collector of the NPN transistor of the common emitter amplifier circuit. The clamp circuit includes a level shift circuit and a clamp diode for suppressing a decrease in the collector potential of the NPN transistor of the common emitter amplifier circuit.