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:
Mar. 04, 2008
Filed:
May. 11, 2004
Motoki Murakami, Yokohama, JP;
Yutaka Igarashi, Yokohama, JP;
Akio Yamamoto, Hiratsuka, JP;
Isao Ikuta, Yokohama, JP;
Yoshiaki Harasawa, Ogo, JP;
Motoki Murakami, Yokohama, JP;
Yutaka Igarashi, Yokohama, JP;
Akio Yamamoto, Hiratsuka, JP;
Isao Ikuta, Yokohama, JP;
Yoshiaki Harasawa, Ogo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
The invention provides a receiving system and a transmitting system capable of decreasing an offset between differential signals and between quadrature signals and improving a manufacturing yield and a semiconductor integrated circuit device for processing a wireless communication signal having therein the systems. A receiving system includes: a local oscillator for generating an oscillation signal in a desired frequency; a 90-degree phase-shifting circuit for generating a signal by shifting a phase of the oscillation signal output from the local oscillator by 90 degrees; a first mixer for mixing one of differential reception signals with an output signal of the first 90-degree phase-shifting circuit and outputting frequency-converted differential signals; and a second mixer for mixing another one of the differential reception signals with an output signal of the local oscillator and outputting frequency-converted differential signals.