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:
Apr. 07, 2009
Filed:
Dec. 21, 2004
Taizo Yamawaki, Tokyo, JP;
Masahiro Ito, Kokubunji, JP;
Masumi Kasahara, Takasaki, JP;
Hiroaki Matsui, Takasaki, JP;
Taizo Yamawaki, Tokyo, JP;
Masahiro Ito, Kokubunji, JP;
Masumi Kasahara, Takasaki, JP;
Hiroaki Matsui, Takasaki, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A transmitter that can reduce noise without using an SAW filter whose IC integration is hard, and copes with two modulation formats of constant envelope modulation and non-constant envelope modulation, and a downsized and low-cost wireless communication apparatus that uses the transmitter are provided. The transmitter includes a quadrature modulator that modulates an input signal by quadrature modulation, a first amplifier that amplifies a modulation signal outputted by the quadrature modulator, and a second amplifier that amplifies an output signal of the first amplifier. The first amplifier operates as a limiter when the modulation format is the constant envelope modulation, and performs linear operation when the modulation format is the non-constant envelope modulation.