PAM reception circuit and reception apparatus

A reception apparatus comprising:

• a PAM reception circuit including
• a first comparison circuit that outputs a first bit value in two-bit values based on a result of a comparison between a reception signal of four-value pulse amplitude modulation in which the two-bit values are associated with four potential levels divided by three threshold values by gray codes and a first threshold value which is a center of the three threshold values,
• an absolute value circuit that outputs an absolute value of a difference between the reception signal and the first threshold value or a negative value obtained by inverting a sign of the absolute value from a positive sign to a negative sign, and
• a second comparison circuit that outputs a second bit value in the two-bit values based on a result of a comparison between a second threshold value which is larger than the first threshold value in the three threshold values and the absolute value or a result of a comparison between a third threshold value which is smaller than the first threshold value in the three threshold values and the negative value;
• and
• a logical circuit which performs a logical calculation using one the first and second bit values as an MSB and the other of the first and second bit values as an LSB.