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:
Jun. 11, 2013
Filed:
Apr. 01, 2008
Akira Nagayama, Tokyo, JP;
Akira Nagayama, Tokyo, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
To provide a power amplifier circuit which is capable of reducing a phase error of an output signal in a case where an amplitude of an input signal is relatively small, as well as a transmitter and a wireless communication device using the same. A constant envelope signal generation circuit () converts an input signal (Si) having envelope variation into a first constant envelope signal (Sd) and a second constant envelope signal (Sd) having the same amplitude and different phases, and outputs the signals. A first amplifier () amplifies the first constant envelope signal (Sd). A second amplifier () amplifies the second constant envelope signal (Sd). An output adder () outputs an amplified output signal having envelope variation based on the amplified signals output from the first amplifier () and the second amplifier (). An amplitude control circuit (reference potential control circuit ()) controls the amplitude of the first constant envelope signal (Sd) and the second constant envelope signal (Sd) based on the amplitude of the input signal (Si).