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. 01, 2011
Filed:
Dec. 26, 2006
Yoshito Shimizu, Kanagawa, JP;
Tomoya Urushihara, Chiba, JP;
Yoshito Shimizu, Kanagawa, JP;
Tomoya Urushihara, Chiba, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An object of the invention is to provide a polar modulation transmitter that can perform adaptive distortion compensation processing without the need for a synchronization adjustment circuit for synchronizing an input baseband signal and an output signal of a power amplifier. An adaptive operation control sectionmeasures the unbalance amount of an output spectrum of a power amplifierand a coefficient adjustment determination section of the adaptive operation control sectionperforms iteration control so that if the unbalance amount is equal to or greater than a predetermined threshold value, coefficient information output to a distortion compensation processing circuitis adjusted and an adjustment is made to distortion compensation processing in the distortion compensation processing circuitand if the unbalance amount is less than the predetermined threshold value, the coefficient information is maintained, whereby the characteristic change of the power amplifierat the environmental temperature change time can be adaptively compensated for without using a synchronization adjustment circuit for synchronizing an input baseband signal and an output signal from the power amplifier