A CMOS detection chip for amperometric sensors with chopper stabilized incremental △∑ ADC  

作　　者：陈敏 刘云涛 肖璟博 陈杰 

机构地区：[1]Institute of Microelectronics, Chinese Academy of Sciences [2]College of Information and Communication Engineering, Harbin Engineering University

出　　处：《Journal of Semiconductors》2016年第6期156-161,共6页半导体学报（英文版）

基　　金：supported by the State Key Development Program for Basic Research of China(No.2015CB352100)

摘　　要：This paper presents a low noise complimentary metal-oxide-semiconductor（CMOS） detection chip for amperometric electrochemical sensors.In order to effectively remove the input offset of the cascaded integrators and the low frequency noise in the modulator,a novel offset cancellation chopping scheme was proposed in the Incremental AS analog to digital converter（IADC）.A novel low power potentiostat was employed in this chip to provide the biasing voltage for the sensor while mirroring the sensor current out for detection.The chip communicates with FPGA through standard built in I2 C interface and SPI bus.Fabricated in 0.18-μm CMOS process,this chip detects current signal with high accuracy and high linearity.A prototype microsystem was produced to verify the detection chip performance with current input as well as micro-sensors.This paper presents a low noise complimentary metal-oxide-semiconductor（CMOS） detection chip for amperometric electrochemical sensors.In order to effectively remove the input offset of the cascaded integrators and the low frequency noise in the modulator,a novel offset cancellation chopping scheme was proposed in the Incremental AS analog to digital converter（IADC）.A novel low power potentiostat was employed in this chip to provide the biasing voltage for the sensor while mirroring the sensor current out for detection.The chip communicates with FPGA through standard built in I2 C interface and SPI bus.Fabricated in 0.18-μm CMOS process,this chip detects current signal with high accuracy and high linearity.A prototype microsystem was produced to verify the detection chip performance with current input as well as micro-sensors.

关 键 词：CMOS amperometric sensors chopper-stabilized system-on-chip（SoC） 

分 类 号：TN792[电子电信—电路与系统]