Understanding and Enhancing Linearity in FinFET Biosensors for Biomolecule Detection

The downscaling of MOSFET has led to different short channel effects (SCEs) such as DIBL, Mobility Degradation and Impact Ionization etc. So different modifications have been carried out in the device structure to control the SCEs. Fin-FET is one of the prominent candidates among all the engineered devices. A FinFET based biosensor is designed to measure the presence of various biomolecules. The change in device characteristics such as drain current and transconductance is studied when the nanocavity of the biosensor is filled with different biomolecules like Protein, Apomyoglobin and Gelatin etc. with different permittivity. Various voltage intercept point and intermodulation distortion has been measured to know the linearity and analog performance of the device and the suitable operating Vgs for the device.