DUAL MODE DUPLEXER OF A MOBILE COMMUNICATION TERMINAL, CONCERNED WITH IMPROVING SEPARATION AND A RECEIVING END NOISE FACTOR OF A GSM MODE AND A TD-SCDMA MODE

摘要

PURPOSE: A dual mode duplexer of a mobile communication terminal is provided to realize a TD-SCDMA(Time Division-Synchronous CDMA) switch, a GSM duplexer, and a switch for on/off operations of a transceiving path as one circuit. CONSTITUTION: A TD-SCDMA separation switch(31) separates a TD-SCDMA transceiving signal. A GSM duplexer(32) separates a GSM transceiving signal. A switch(33) connects an antenna(35) with the TD-SCDMA separation switch(31). A switch(34) connects the antenna(35) with the GSM duplexer(32). When the switch(33) is turned on to operate a TD-SCDMA mode, the TD-SCDMA separation switch(31) is connected to the antenna(35), and is switched by a TX-ON signal to transmit a TD-SCDMA signal and by an RX-ON signal to receive the TD-SCDMA signal.