A 1.5 v High Swing Ultra-Low-Power Two Stage CMOS OP-AMP in 0.18 µm Technology

A High Swing Ultra-Low-Power Two Stage CMOS OP-AMP in 0.18 μm Technology with 1.5v supply, is presented.Topology selection and theoretical analysis of the design are discussed. Cascode technique has been used to increase the dc gain. The unity-gain bandwidth is also enhanced using a gain-stage in the Miller capacitor feedback path. The proposed opamp provides 236 MHz unity-gain bandwidth, 81.3 degree phase margin and a peak to peak output swing 1.26 v. The circuit has 92.5 dB gain and slew rate is 16.75 v/μs . The power dissipation of the designed only is 50 μw. The designed system demonstrates relatively suitable response in different temperature.