Patent ID: 7271652

Claim:
A differential amplifier comprising: first and second input terminals to which a differential signal composed of first and second signals is inputted; first and second level shift circuits for shifting respective voltages of the first and second signals inputted to the first and second input terminals; a reference voltage source; first and second voltage limit circuits for limiting the voltage of the differential signal level-shifted by the first and second level shift circuits with a voltage of the reference voltage source; a first differential couple and a first current source for converting the differential signal having the voltage limited by the first and second voltage limit circuits to currents; third and fourth level shift circuits for shifting the respective voltages of the first and second signals inputted to the first and second input terminals; third and fourth voltage limit circuits for limiting the voltage of the differential signal level-shifted by the third and fourth level shift circuits with the voltage of the reference voltage source; a second differential couple and a second current source for converting the differential signal having the voltage limited by the third and fourth voltage limit circuits to currents; and first and second output terminals to which an output of the first differential couple and an output of the second differential couple are connected commonly.