Patent ID: 7162201

Claim:
A repeater having a plurality of amplifiers for automatically setting an output signal level, comprising: an input means for receiving an object input level and an object output level; a signal generation means for generating a signal according to the inputted object input level; an amplifying means for amplifying the signal outputted from the signal generation means; and a comparison means for measuring a voltage of amplified signal from the amplifying means, setting an output level according to the measured voltage and controlling the output signal of the repeater; wherein the comparison means includes: a voltage detector for measuring a voltage of the amplified signal from the amplifying means; a digital variable resistor for providing a reference voltage value; a comparator for comparing the measured voltage from the voltage detector and the reference voltage value from the digital variable resistor and providing a result of comparison; and a controller for controlling the digital variable resistor in order to output the reference voltage value and controlling the output signal of the repeater by comparing the detected voltage from the voltage detector and the reference voltage value.