INTERFERENCE NOISE SIGNAL ELIMINATOR USING A SIGNAL COMBINING AND CANCELING TECHNIQUE, PARTICULARLY FOR GENERATING A COUNTER SIGNAL HAVING THE SAME AMPLITUDE, A 180-DEGREE PHASE DIFFERENCE AND THE SAME TIME DELAY AS A SIGNAL TO BE ELIMINATED IN ORDER TO ELIMINATE THE UNDESIRED SIGNAL COMPONENT

摘要

PURPOSE: An interference noise signal eliminator using signal combining and canceling technique is provided to prevent saturation and oscillation of an amplifier and maintaining a uniform output by eliminating an inputted feedback signal. CONSTITUTION: A demodulator(402) down-converts an RF signal, which has been received after being modulated, into a low frequency band, separates it into I(In-phase)/Q(Quadrature-phase) signals as necessary, and generates a baseband analog signal. An AD converter(404) samples the analog baseband signal according to a sampling rate, converts it into a digital signal and transmits digital data to a variable adjuster(406). The variable adjuster(406) precisely and digitally adjusts a desired amplification/attenuation value, a phase change value and a time delay value. A DA converter(408) converts the digital signal, which has been outputted from the variable adjuster(406), into an analog baseband signal. A modulator(410) performs the opposite function of the demodulator(402). An adaptive state monitoring/controlling unit(412) monitors an input/output state so that an input signal and a counter signal generated from a counter signal generator(400) are coupled at a coupling point of a signal coupler and thus the input signal can be completely eliminated, and controls the elements of the counter signal generator(400).