PURPOSE: A parallel equalizer is provided to process low frequency and high frequency bands using low power by differently controlling each frequency gain characteristic of each amplifier. CONSTITUTION: An equalizer(100) includes a first amplifier which differentially amplifies a first input signal and a second input signal. The equalizer includes a second amplifier connected to the first amplifier in parallel. The second amplifier differentially amplifies the first input signal and the second input signal. The output of the equalizer is made by combining the output signal of the first amplifier and the output signal of the second amplifier. The first amplifier and the second amplifier control a zero point and a pole point by variable resistance and variable capacitance. A high frequency band gain in the secondary amplifier is larger than a low frequency band gain in the first amplifier.
