Patent ID: 7907011

Claim:
A folded cascode operational amplifier comprising: a first folded cascode operational amplifier, of a first conductivity type, configured to be driven in response to a first input signal and a second input signal, the first folded cascode operational amplifier including a first current mirror, a first bias circuit, and a second bias circuit connected in series between a first power supply voltage line, a first node, and a second node; a second folded cascode operational amplifier, of a second conductivity type, configured to be driven in response to the first input signal and the second input signal, the second folded cascode operational amplifier including a second current mirror, a third bias circuit, and a fourth bias circuit connected in series between a second power supply voltage line, a third node, and a fourth node; an output buffer configured to buffer a voltage amplified based on a voltage of the second node and a voltage of the fourth node; a first capacitor connected between an output terminal and a fifth node between the first current mirror and the first bias circuit; a second capacitor connected between the output terminal and a sixth node between the second current mirror and the third bias circuit; a bias constant current source connected between the first node and the third node; and a bias constant voltage source connected between the second node and the fourth node.