Patent ID: 8497739

Claim:
A single-differential converting circuit comprising: a fully-differential type operational amplifier including a first input terminal, a second input terminal, a first output terminal having a same polarity with the first input terminal, and a second output terminal having an opposite polarity to the first input terminal; a first input impedance element having one end receiving an input signal and the other end connected to the first input terminal; a second input impedance element having one end receiving a reference voltage and the other end connected the second input terminal; a first negative feedback impedance element connected between the second input terminal and the first output terminal; a second negative feedback impedance element connected between the first input terminal and the second output terminal; and a positive feedback impedance element connected between the second input terminal and the second output terminal, wherein the second negative feedback impedance element includes a third negative feedback element and a fourth negative feedback element, wherein an impedance value of the first negative feedback impedance element and an impedance value of the third negative feedback element are equal, and wherein an impedance value of the positive feedback impedance element and an impedance element of the fourth negative feedback element are equal.