TRANSMISSION OUTPUT DETECTION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a transmission output detection circuit which can detects the sending electric power in a simple constitution and without increasing transmission current. SOLUTION: This detection circuit is used for a radio transceiver of a TDD communication system which contains a TDD switch 3 that connects a sending system to the antenna systems 1 and 2 in a sending period and then connects a receiving system to the systems 1 and 2 in a receiving period. A detection means 14 is added to the detection circuit to detect the transmission output based on the electric power that is leaked out in the transmission period of the switch 3. In such a constitution, the transmission output is detected with low power consumption and with no branching of the transmission electric power.