Patent ID: 6384683
Filing Date: 2002-05-07
Classification: H03F

Abstract:
An intermediate stage for a CMOS operational amplifier comprising:a first current mirror receiving first differential inputs and having an first current mirror input; a second current mirror receiving second differential inputs and having a second current mirror input; and a floating current mirror comprising: a first NMOS transistor (500) having a drain coupled to a first power supply terminal through a load (600); a second NMOS transistor (502) having a drain connected to the first current mirror input and having a gate connected to the gate of the first NMOS transistor (500); a first PMOS transistor (503) having a drain and gate connected in common, and having a source coupled to the source of the first NMOS transistor (500); a second PMOS transistor (505) with a source connected to the source of the second NMOS transistor (502), and with a drain connected to the second current mirror input; a first voltage supply (602) having a first terminal coupled to the first power supply terminal and having a second terminal connected to the gates of the first NMOS transistor (500) and the second NMOS transistor (502); and a first current source (508) having a first terminal connected to the drain of the first PMOS transistor (503) and a second terminal connected to a second power supply terminal.