Patent ID: 8836427

Claim:
A folded cascode operational amplifier, comprising: a first current source; a second current source; a first voltage terminal connected to the first current source and the second current source; a first input-transistor connected to the first current source in series; a first metal-oxide-semiconductor field-effect transistor (MOSFET) connected in series between the first current source and the first input-transistor; a second input-transistor connected to the second current source in series; a tail current source connected to a connection point between the first input-transistor and the second input-transistor; a load current source; a second voltage terminal connected to the tail current source and the load current source; an output-transistor connected to the load current source; and an output-terminal arranged between the second current source and the second input-transistor and connected to the output-transistor, wherein the second current source is a mirroring current source of the first current source, and a ratio of a current passing through the second current source to a current passing through the first current source is greater than one.