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. 20, 2011
Filed:
Dec. 19, 2005
Yoshiaki Hasegawa, Yokohama, JP;
Akihiro Saito, Yokohama, JP;
Tomoya Uchiike, Yokohama, JP;
Yoshihiro Kanomata, Yokohama, JP;
Yoshiaki Hasegawa, Yokohama, JP;
Akihiro Saito, Yokohama, JP;
Tomoya Uchiike, Yokohama, JP;
Yoshihiro Kanomata, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A receiver of a wireless base station that uses a simple mode to detect a failure is provided, and an SWswitches whether an input port of the receiveris to be connected with an antennaor to be terminated. An LNA (a low noise amplifier)amplifies an input signal with a low distortion. SWsandswitch between a first path which runs through the LNAand a second pathwhich does not run through the LNA. An AGC AMP, the gain of which is controlled such that the output thereof is constant, amplifies the signal with the controlled gain. A base station control section uses the SWto terminate the input port of the receiver so that thermal noise is input to the LNA. Further, the SWsandare changed over to determine the normality of the receiver based on the fact that a first gain of an AGC-AMPwhen connected to the first path, a second gain of the AGC-AMPwhen connected to the second path, and a difference between the first and second gains fall within their respective predetermined ranges.