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. 29, 2009
Filed:
Dec. 22, 2006
Masayuki Sugiura, Kanagawa-ken, JP;
Yasuhiko Kuriyama, Kanagawa-ken, JP;
Masayuki Sugiura, Kanagawa-ken, JP;
Yasuhiko Kuriyama, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A power amplifier including an active device having at least one heterjunction bipolar transistor based on a compound semiconductor; a diode connected between the base and the emitter of the bipolar transistor in reverse direction with respect to the base-emitter diode; a resistor connected in series between one electrode of the diode and the base of the bipolar transistor; and a bias circuit connected between the diode and the resistor, wherein the bipolar transistor includes a plurality of transistors, and each transistor is connected to the bias circuit via a resistor connected to a base of the transistor. The bias circuit may include an emitter follower circuit having a bipolar transistor.