| 摘要 |
PROBLEM TO BE SOLVED: To provide an RF front end module which implements space saving within an antenna radome.SOLUTION: The RF front module comprises: an N-band duplexer, N being an integer equal to or greater than 1; N pieces of LNAs connected to the N-band duplexer; a first monitor which is connected to an output terminal of the LNA and measures average power of LNA output signals; an automatic level detector which acquires the average power of LNA output signals from the first monitor each time a predetermined time passes; a gain controller which executes amplification or attenuation of a gain of LNA output signals in such a manner that the average power of LNA output signals acquired by the automatic level detector becomes equal with input power to a predetermined optical circuit; and an electric/optical conversion circuit which converts an electric signal outputted from the gain controller into an optical signal. |
