Patent ID: 7795931

Claim:
A differential output circuit, comprising: a digital circuit that receives a power voltage from a first power source and a third power source, and generates a first non-inverted output signal and a second inverted output signal related to a first input signal; a first output circuit that receives a power voltage from the first power source and a fourth power source, and controls an output voltage for a first side signal in a differential signal related to a first output signal; a second output circuit that receives and operates by a power voltage from the first power source and the fourth power source, and controls an output voltage for a second side signal in the differential signal related to a second output signal; and a first common voltage control circuit that receives and operates by a power voltage from the first power source and a second power source, and outputs a comparison result of both voltages of output terminals of the first output circuit and the second output circuit with a reference voltage, wherein the first output circuit has a first control circuit that controls the output voltage for the first side signal in the differential signal, the second output circuit has a second control circuit that controls the output voltage for the second side signal in the differential signal, and the first control circuit and the second control circuit control voltages for the first side signal and the second side signal in the differential signal to adjust a common voltage of the differential signal related to the comparison result from the first common voltage control circuit.