Ultra Low Current Measurement with On-chip High Resistance of MOSFET Array

We propose on-chip high resistance using MOSFET array. We adopt the potentiostat method as an electrochemical sensing to measure ultra low current being aware of biosensing and implant sensing. The sensor circuit includes a high resistance array which is configured by connecting unit resistors in series and parallel. We verify the DC characteristics, the area, and the temperature characteristics of the resistor array by the SPICE simulation, then demonstrate the promising result compared with the conventional Poly resistance.