Patent ID: 7064609

Claim:
An operational amplifier comprising the following: a positive input terminal; a negative input terminal; a first current source; a second current source; a first differential pair coupled to the first current source, the first differential pair including a first field effect transistor and a second field effect transistor, each of the first and second field effect transistors having a source, drain, gate and bulk terminal, wherein the gate terminal of the first field effect transistor is coupled to the positive input teal and the gate terminal of the second field effect transistor is coupled to the negative input terminal; and a second differential pair coupled to the second current source, the second differential pair including a third field effect transistor and a fourth field effect transistor, each of the third and fourth field effect transistors having a source, drain, gate and bulk terminal, wherein the bulk terminal of the third field effect transistor is coupled to the negative input terminal and the bulk terminal of the fourth field effect transistor is coupled to the positive input terminal.