Patent ID: 8743944

Claim:
A decision feedback equalizer comprising: an amplifying circuit supplied with received data; a duobinary signal decision device determining an output signal from said amplifying circuit, said duobinary signal decision device including a first D flip-flop and a second D flip-flop, said first D flip-flop supplied with said output signal and a high reference potential and outputting a result of a comparison between the high reference potential and said output signal, and said second D flip-flop supplied with said output signal and a low reference potential and outputting a result of a comparison between the low reference signal and said output signal; a first shift register for successively shifting the result output by said first D flip-flop; a second shift register for successively shifting the result output by said second D flip-flop; and a plurality of current control blocks supplied with respective output signals from said first shift register and with respective output signals from said second shift register and for feeding back output signals to an output terminal of said amplifying circuit to control the potential thereof.