Design of CNTFET based Biosensor Interface Circuit for Array Sensors

Abstract

FET based biosensors are more promising devices for detecting cancer due to cost benefits, faster response and simple approach. For a biosensor to be used in a real environment for both clinical and lab applications, the electronic circuits that process the signals from biosensors and identify the changes in signal properties is a significant activity. The design of interface circuits and signal conditioning circuits need to be designed according to the biosensor responses.In this work, the design of a biosensor array interfacing circuit is carried out using CNTFETs. In order to improve the sensor performances, sensor arrays are developed. The design of sub-circuits for interfacing circuits and signal conditioning circuits is also presented. The sensitivity is enhanced with a sensor array model that has eight columns of series-connected biosensors. The 8x8 array model is interfaced with an instrumentation amplifier. The analog readout circuit is designed with a reference electrode for the real-time comparison of the sensor array model. All of the circuits are designed using CNTFETs, modelled using SPICE coding and simulated in SPICE environment.