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:
Nov. 30, 1999
Filed:
Nov. 21, 1997
Takeshi Tanemura, Fukushima-ken, JP;
Alps Electric Co., Ltd., , JP;
Abstract
A gain-control-type transistor power amplifier is provided which performs gain control in a state in which there is satisfactory linearity by extending the varying range of a gain control voltage capable of controlling the output level of an RF signal. The gain-control-type transistor power amplifier includes an amplifying transistor, to the base of which a bias voltage and an amplification signal are supplied, and a control transistor, to the base of which a gain control voltage is supplied. The gain control voltage output from the emitter of the control transistor is supplied to the base of the amplifying transistor in such a manner as to be superposed onto the base bias, and the base bias voltage is varied by the supplied gain control voltage, controlling the gain of the amplifying transistor and the output level of the RF signal.