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:
Oct. 11, 2011
Filed:
Nov. 10, 2009
Yoichi Okubo, Tokorozawa, JP;
Manabu Nakamura, Akishima, JP;
Yasuhiro Takeda, Kodaira, JP;
Taizo Ito, Kodaira, JP;
Junya Dosaka, Hamura, JP;
Terufumi Nagano, Hamura, JP;
Hidekatsu Ueno, Kodaira, JP;
Toshio Nojima, Sapporo, JP;
Yoichi Okubo, Tokorozawa, JP;
Manabu Nakamura, Akishima, JP;
Yasuhiro Takeda, Kodaira, JP;
Taizo Ito, Kodaira, JP;
Junya Dosaka, Hamura, JP;
Terufumi Nagano, Hamura, JP;
Hidekatsu Ueno, Kodaira, JP;
Toshio Nojima, Sapporo, JP;
Hitachi Kokusai Electric Inc., Tokyo, JP;
Abstract
An amplifier capable of lowering an electrical current flowing in a peak amplifier before a carrier amplifier becomes saturated to thereby improve the efficiency of an entirety of the amplifier is provided. The amplifier includes a carrier amplifier circuit having an amplifying element operable in class-AB or class-B, and a plurality of peak amplifier circuits which have amplifying elements operating in class-B or class-C and which are arranged to start an operation in stages in response to an input level. An output of the carrier amplifier circuit and outputs of the peak amplifier circuits are combined together for signal output. One of the peak amplifier circuits which is rendered operative at the lowest input level is smaller in saturation output than the carrier amplifier circuit.