A Low Voltage Opamp Based on Current Mirror Technique for Bio-medical applications

Low operating power supply is very critical for advanced CMOS technology based circuits. A technique to reduce the minimum operating V_dd of opamp has been proposed by deploying a source follower based level shifter. Demonstrated the robustness of the proposal in 65nm CMOS technology and simulated with Spectre. Simulation results show that 60dB dc gain and 10MHz bandwidth of the opamp. Compared to the conventional folded cascode opamp, the present proposal makes opamp works up to 0.8V while conventional one fails at 1.3V. Circuit Draws with 205uA from 1.5V supply and occupying 0.002464mm² silicon area.