Reception circuit and communication system

A reception circuit that receives a reception signal according to a signal transmitted from a transmission electrode through a reception electrode capacitively coupled to the transmission electrode, comprising:

• an adder configured to add one or more feedback signals to the reception signal;
• a hysteresis circuit having hysteresis in input and output characteristics, and configured to output output data according to an output signal of the adder;
• a first coefficient adder configured to add a first coefficient to the output data of the hysteresis circuit;
• a first flip-flop configured to hold output data of the first coefficient adder;
• a second coefficient adder configured to add a negative second coefficient to the output data of the hysteresis circuit;
• a second flip-flop configured to hold output data of the second coefficient adder;
• a selector configured to select output data of the first flip-flop or output data of the second flip-flop, and output the selected output data;
• a shift register configured to sequentially shift the output data of the selector and control selection by the selector by the output data shifted once;
• and
• a feedback signal generator configured to generate the feedback signal, according to each output data of the shift register.

A communication system comprising:

• a transmission circuit configured to transmit a signal from a transmission electrode;
• and
• a reception circuit configured to receive a reception signal according to the transmitted signal through a reception electrode capacitively coupled to the transmission electrode,
• wherein the reception circuit comprises
• an adder configured to add one or more feedback signals to the reception signal,
• a hysteresis circuit having hysteresis in input and output characteristics, and configured to output output data according to an output signal of the adder,
• a shift register configured to sequentially shift the output data of the hysteresis circuit, and
• a feedback signal generator configured to generate the feedback signal according to each output data of the shift register.