ISFET sensor integrated with a CMOS currenti sink for signal conditioning

At present, array organised silicon integrated chemical senosrs, coupled with first-processing circuits, are object of many research activities. This rising interest is justified by the possibilityto exploit the unique features of microeletronics, nemely cost effective batch fabrication, miniaturisation with established reliability and co-integration of sensing parts with minimal electronica. In this work, the design and the characterisation of a CMOS current-mode preamplifief with an on-chip ISFET sensor is presented. The proposed configuration has been studied and implemented, as minimal pre-amplification stage, on ISFET array based micro-systems for biomedical diagnostic and analysis. The main goal is to get a polarisation circuit small in size, stable and simple to be integrated and connected to a external multiplexing stage