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. 21, 2004
Filed:
May. 28, 2003
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A power amplifier capable of compensating for distortion by pre-distortion and achieving a large distortion suppressing effect even if IM3L components and IM3U components occurring at the power amplifier have a large level difference. A power amplifying circuit amplifies an original signal. An envelope detector generates an envelope signal having components identical to envelope components included in the original signal. Based on the original signal a distortion signal generating circuit generates a distortion signal for canceling distortion components occurring while the original signal is amplified by the power amplifying circuit . In a power combiner , the envelope signal is injected to the original signal, thereby eliminating the asymmetric characteristic of the distortion components. In the power amplifying circuit , the distortion signal is injected to the original signal, thereby suppressing the distortion components.