A low power, high accuracy amperometric potentiostat for NOx gas sensors

摘要

A low power, 1-V and an area efficient CMOS amperometric potentiostat is designed for gas sensors exploiting the benefits of room temperature ionic liquids. A regulated cascode current mirror is used as current replicating interface, which results in better performance in terms of gain, input/output resistance, bandwidth and linearity. The potentiostat is implemented in 65 nm CMOS standard process, resulting in detection of redox current of 0.2 nA-12.3 μA and having a power consumption of 11.5 μW, while having an area of 0.018 mm2.