APPARATUS FOR ENHANCING THE RECEIVE SENSITIVITY OF A BASE STATION, PARTICULARLY RELATED TO REMOVING A TRANSMISSION SIGNAL OF AN ADJACENT FA WORKING AS AN INTERFERENCE SIGNAL BY USING A GENERAL HIGH FREQUENCY SAW FILTER

摘要

PURPOSE: An apparatus for enhancing a receive sensitivity of a base station is provided to enable the expansion of an FA although a separation distance between transmission/reception bands is short. CONSTITUTION: A duplexer(110) switches a transmission signal and a reception signal. A coupler(120) couples a transmission signal outputted from the duplexer(110) and a signal received through an antenna. A narrowband LNA(Low Noise Amplifier)(130) amplifies a reception signal outputted from the duplexer(110), and enhances the receive sensitivity by suppressing an interference signal which is out of a band. An LNA(131) amplifies the reception signal outputted from the duplexer(110). A SAW(Surface Acoustic Wave) filter(132) enhances the receive sensitivity by suppressing the interference signal which is out of the band and included in the reception signal outputted from the LNA(131).