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:
Dec. 10, 2013
Filed:
Oct. 06, 2011
Kazutaka Takagi, Kawasaki, JP;
Naotaka Tomita, Kawasaki, JP;
Kazutaka Takagi, Kawasaki, JP;
Naotaka Tomita, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, a class-C power amplifier includes an amplifying element whose power supply voltage is expressed as Vdc and whose maximum current is expressed as Imax, a conduction angle θo of the amplifying element being less than π(rad), and load impedance of a fundamental wave being expressed as Z=R+j·Xand load impedance of a 2nd harmonic being expressed as Z=R+j·Xwhich are observed from a dependent current source of an equivalent circuit of the amplifying element, wherein a relationship between variables Xand Ris set to −R<=X<=R, variable Ris set to R=Vdc/Imax·π·{1−cos(θo/2)}/{θo/2−sin(θo)/2}, and variable X/Xis set to X/X=−{θo/2−sin(θo)/2}/{sin(θ/2)−sin(1.5·θo)/3}, or each of the variables is set thereto so as to become equal substantially.