Parameter Analysis of CMOS Amplifier Toplogies for Biosensors

Abstract

 In this paper we designed amplifiers with different topologies for different application including biosensors. Parameters of all topologies are simulated and compared. We designed two stage, folded cascade with low power as these two designs are used in many applications. The circuits are designed and simulated in VLSI CAD Cadence 180nm technology. Folded cascade amplifiers are used in design of Trans impedance amplifier which is first stage of biosensor interface, which measures low redox current generated by sensor.  Parameter analyzed in this work are transconductance, power, area and gain. Results shows folded cascade gain 77.97Db and power 0.925 mW since folded cascade amplifier is mainly considered one of important amplifier in Trance Impedance Amplifier (TIA) for analog front end design.