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:
Sep. 16, 2008
Filed:
Aug. 19, 2005
Satoshi Tanaka, Kokubunji, JP;
Kazuyuki Hori, Tokyo, JP;
Manabu Kawabe, Hachioji, JP;
Yukinori Akamine, Kokubunji, JP;
Masumi Kasahara, Takasaki, JP;
Kazuo Watanabe, Takasaki, JP;
Satoshi Tanaka, Kokubunji, JP;
Kazuyuki Hori, Tokyo, JP;
Manabu Kawabe, Hachioji, JP;
Yukinori Akamine, Kokubunji, JP;
Masumi Kasahara, Takasaki, JP;
Kazuo Watanabe, Takasaki, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A ΣΔ transmitter that permits setting of a loop filter LF, a charge pump current and other factors to the same conditions even if it is operated in a plurality of frequency bands, therefore allows the number of components to be reduced and at the same time enables the angle between the phases of local signals for reception use to be close to exactly 90°, which is a feature ensuring robustness against inter-element variations and accordingly suitable for large scale integration, is to be provided. The oscillation frequency of a VCO is set to an even-number multiple of the transmit frequency, and generates transmit signals via a divider. A device that varies the gain according to the amplitude component of modulating signals is added to an amplifier whose input is signals from the VCO, and the transmission of modulating signals involving amplitude modulation, such as EDGE, is thereby made possible.