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. 25, 1993
Filed:
Aug. 06, 1991
Applicant:
Inventor:
Yukichi Aihara, Kawasaki, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03G / ;
U.S. Cl.
CPC ...
330279 ; 330129 ; 455116 ; 455126 ;
Abstract
In a radio transmitter, a part of an output of a transmission output amplifying circuit is supplied to a variable attenuating circuit and an output of the variable attenuating circuit is supplied to a detecting circuit. An output of the detecting circuit and a reference voltage are compared and a control voltage is given to the transmission power amplifying circuit in accordance with the result of the comparison, thereby controlling the transmission output. By controlling the attenuation amount of the variable attenuating circuit, the transmission output can be controlled over a wide dynamic range with a high reproducing fidelity.