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:
Feb. 08, 2011
Filed:
Mar. 27, 2008
Satoshi Tanaka, Kokubunji, JP;
Kazuo Watanabe, Takasaki, JP;
Masao Hotta, Hannou, JP;
Toyohiko Hongo, Musashimurayama, JP;
Taizo Yamawaki, Tokyo, JP;
Masumi Kasahara, Takasaki, JP;
Kumiko Takikawa, Tama, JP;
Satoshi Tanaka, Kokubunji, JP;
Kazuo Watanabe, Takasaki, JP;
Masao Hotta, Hannou, JP;
Toyohiko Hongo, Musashimurayama, JP;
Taizo Yamawaki, Tokyo, JP;
Masumi Kasahara, Takasaki, JP;
Kumiko Takikawa, Tama, JP;
Renesas Technology Corp., Tokyo, JP;
TTPCOM Limited, Melbourne, Royston Hertfordshire, GB;
Abstract
A transceiver suitable for larger scale of integration employs direct conversion reception for reducing the number of filters. Also, the number of VCOs is reduced by utilizing dividers to supply a receiver and a transmitter with locally oscillated signals at an RF band. Dividers each having a fixed division ratio are used for generating locally oscillated signals for the receiver, while a divider having a switchable division ratio are used for generating the locally oscillated signal for the transmitter. In addition, a variable gain amplifier for baseband signal is provided with a DC offset voltage detector and a DC offset canceling circuit for supporting high speed data communications to accomplish fast cancellation of a DC offset by eliminating intervention of a filter within a feedback loop for offset cancellation.