| 摘要 |
A differential amplifier circuit includes a differential amplifier having inversion and non-inversion input terminals and input amplifiers each individually connected to one of these input terminals, serving to receive an input voltage within a certain range and output it as another voltage in a smaller range. The differential amplifier is of a kind using n-type and p-type MOS transistors with threshold voltages given respectively by Vthn and Vthp, and connected to a source voltage VDD and a reference voltage Vref. Input voltages to the input amplifiers within the range between Vref and VDD, are outputted within the range between (VDD-Vthp) and (Vref+Vthn), or preferably between (VDD-1.5Vthp) and (Vref+1.5Vthn). The input amplifiers may each comprise a CMOS buffer circuit having an output line connected to the differential amplifier and impedance elements such as resistors or transistors with one connected between the output line and the reference voltage and another connected between the output line and the source voltage.
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