RFID READER AND METHOD FOR CONTROLLING GAIN THEROF

摘要

PURPOSE: An RFID(Radio Frequency IDentification) reader and a method for controlling a gain thereof are provided to maintain the gain of a signal of an RFID tag at a predetermined size. CONSTITUTION: An RFID(Radio Frequency IDentification System) reader(10) comprises an amplifier(111) and an AGC(Auto Gain Control) circuit(240). In correspondence to an ACG signal, the amplifier controls the gain of the signal received from an RFID tag. The ACG circuit measures the signal level at a section before a preamble of the reception signal. Based on the measured signal level, the ACG circuit generates the ACG signal for the control of the gain of the received signal.