TRANSMISSION DEVICE OF A MOBILE COMMUNICATION TERMINAL, SPECIFICALLY IN CONNECTION WITH COMPENSATING FOR A POWER CHANGE OF A TRANSMISSION SIGNAL AND A MISMATCH STATE OF AN ANTENNA

摘要

PURPOSE: A transmission device of a mobile communication terminal is provided to sense an impedance change of a transmission antenna, and to compensate for a power change of a transmission signal and a mismatch state of the antenna with an impedance compensation value and a transmission output compensation value, thereby improving performance. CONSTITUTION: In an isolation port of a directional coupler(108), a baseband signal processor(100) senses an impedance change of a transmission antenna(110) with a signal reflected from the transmission antenna(110), outputs a bias voltage for compensating for impedance matching of the antenna(110), and outputs a power control signal which compensates for power strength of a transmission signal to amplifiers(103,105). An impedance matching unit(109) is installed between an output end of the directional coupler(108) and the transmission antenna(110), and executes an impedance matching process of the antenna(110) by the bias voltage.