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The OP-amplifier of claim 3, wherein a transconductance of a transistor connected to the first output terminal is smaller than a transconductance of a transistor connected to the second output terminal from the transistors of the first differential input circuit, and a transconductance of a transistor connected to the first output terminal is greater than a transconductance of a transistor connected to the second output terminal from the transistors of the second differential input circuit.ĥ. The OP-amplifier of claim 2, wherein the first output terminal is connected to transistors in the first and second differential input circuits for sensing an output voltage of the OP-amplifier, and the second output terminal is connected to transistors in the first and second differential input circuits for sensing an input voltage of the OP-amplifier.Ĥ. The OP-amplifier of claim 1, wherein the first bias circuit is controlled according to the first voltage output from the differential mode feedback circuit, and the second bias circuit is controlled according to the second voltage output from the differential mode feedback circuit.ģ.
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An OP-amplifier comprising: an input unit having a mirror circuit and first and second differential input circuits, wherein the mirror circuit has first and second output terminals, the first differential input circuit having a first bias circuit and the second differential input circuit having a second bias circuit an output unit for amplifying an output signal of the first and second differential input circuits and a differential mode feedback circuit for sensing a voltage difference between an output voltage and an input voltage applied to the first and the second differential input circuits, for outputting a first voltage and a second voltage based on the voltage difference, and for feeding back the first voltage to the first bias circuit and feeding back the second voltage to the second bias circuit to remove an offset voltage.Ģ.