Patent ID: 8278962

Claim:
A transfer circuit comprising: a transmitter that outputs a transmission signal; and a receiver that receives the transmission signal, wherein the receiver supplies to the transmitter a feedback signal for controlling a common level of the transmission signal output from the transmitter, the transmitter controls the common level of the transmission signal output therefrom, in accordance with the feedback signal received from the receiver, the receiver includes: a receiving section that operates in accordance with the transmission signal; a reference level generating section that generates a reference level representing an expected level for the common level of the transmission signal input into the receiving section; a comparing section that compares the common level of the transmission signal input into the receiving section against the reference level and generates the feedback signal in accordance with a result of the comparison, and the reference level generating section includes a set of reference voltage-dividing resistances that are provided between a positive power supply line and a negative power supply line of the receiving section and generate the reference level by dividing a power supply voltage of the receiving section.