| 摘要 |
PURPOSE: A module device for switching an LNA(Low Noise Amplifier) of a base station receiving circuit is provided to integrate LNAs installed on a base station receiving circuit end with one switching module having a preliminary amplifier, and to switch into the preliminary amplifier when one of the LNAs fails, thereby magnifying maintenance of a sector-type base station. CONSTITUTION: The first to the third duplexing receiving modules(3A-3C) consist of many duplexers(2A-2F) for separating receiving call signals only from signals inputted/outputted through many antennas(1A-1F). An LNA switching module(4) amplifies the receiving call signals outputted from the first to the third duplexing receiving modules(3A-3C) by connecting LNAs on rear ends of the receiving modules(3A-3C), and switches failed LNAs. Distributors(6A-6F) distribute each receiving output signal outputted by each receiving path(5A-5C) from the LNA switching module(4), and output the distributed signals by each receiving paths(5A-5C). Many up/down converters(7A-7F) down-convert the receiving output signals at frequency levels, and output the down-converted signals, respectively. A channel processing board(8) routes call signals inputted/outputted by each receiving path(5A-5C) from the up/down converters(7A-7F). A switching module controller(9) confirms that a failure alarming signal is generated from the integrated LNAs, and controls a switching function of the LNAs.
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