Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2005-12-19
2011-12-20
Nguyen, Duc (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
Reexamination Certificate
active
08082006
ABSTRACT:
A receiver of a wireless base station that uses a simple mode to detect a failure is provided, and an SW201switches whether an input port of the receiver133is to be connected with an antenna114or to be terminated. An LNA (a low noise amplifier)205amplifies an input signal with a low distortion. SWs202and203switch between a first path which runs through the LNA205and a second path204which does not run through the LNA205. 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 SW201to terminate the input port of the receiver so that thermal noise is input to the LNA205. Further, the SWs202and203are changed over to determine the normality of the receiver based on the fact that a first gain of an AGC-AMP211when connected to the first path, a second gain of the AGC-AMP211when connected to the second path, and a difference between the first and second gains fall within their respective predetermined ranges.
REFERENCES:
patent: 11-017629 (1999-01-01), None
patent: 2001-127715 (2001-05-01), None
patent: 2002-246978 (2002-08-01), None
patent: 2003-037551 (2003-02-01), None
Hasegawa Yoshiaki
Kanomata Yoshihiro
Saito Akihiro
Uchiike Tomoya
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Jain Ankur
Nguyen Duc
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