AUTOMATIC GAIN CONTROLLOR, TRANSMITTER HAVING ITS, AND AUTOMATIC GAIN CONTROLLING METHOD THEREOF

摘要

PURPOSE: An automatic gain controller, transmitter having its, and automatic gain controlling method thereof are provided to control a variable gain amplifier through using communications distance. CONSTITUTION: The communications distance between a second transceiver(200) and a first transceiver(100) are measured. The gain values of a transmitting terminal and a receiving terminal in the first and second transceivers are controlled the measured communications distance. The measured communications distance is calculated by using a transmission time of a distance measurement signal.