Patent ID: 7956690

Claim:
An operational amplification circuit comprising: a differential amplification circuit portion that amplifies a differential input; and an output circuit portion that outputs the amplified output using a signal amplified in the differential amplification circuit portion, wherein the differential amplification circuit portion comprises a pair of first transistors to which signals are differentially input, and second and third transistors which are connected to current paths of the pair of first transistors and which constitute a current mirror circuit with respect to each other, wherein the output circuit portion comprises a fourth transistor, a gate of which is connected to a drain of the second transistor, and an amplified output is output from a drain of the fourth transistor, and wherein a fifth transistor, a gate of which is connected to the drain of the second transistor, is provided between the second transistor and the ground, and a sixth transistor, a gate of which is connected to the drain of the third transistor, is provided between the third transistor and the ground.