Implementation of Rail-to-Rail Operational Amplifier for Biomedical Applications

This paper proposes gain boosting architecture of a rail-to-rail folded cascaded operational amplifier with CMFB scheme that employing fully differential pair amplifier for applications to biomedical signal process. The proposed rail-to-rail folded cascaded single stage OPA is design and implemented using the TSMC 0.35μm CMOS 2P4M process. Based on simulated and measured results , the chip size is with power dissipation about 1.6mW, input common mode votage range from 0V to 3.3 V, maximum DC gain 82 dB, 114 dB CMRR and 86 dB PSRR.