CHEN Kun1, MENG Li-ya1, LAI Xiao-feng2, et al. Design of current-mirror-based CMOS potentiostat for amperometric chemical sensors[J]. 2011, 30(5): 107-109.
CHEN Kun1, MENG Li-ya1, LAI Xiao-feng2, et al. Design of current-mirror-based CMOS potentiostat for amperometric chemical sensors[J]. 2011, 30(5): 107-109. DOI: 10.13873/j.1000-97872011.05.009.
基于电流镜的电化学CMOS恒电位仪的设计
摘要
设计了一种基于电流镜的三电极电化学传感器CMOS恒电位仪电路
由控制运放、电流镜和单端输出的跨导放大器构成。与传统的恒电位仪相比
该电路结构简单
减少了读出电路的功耗和版图面积
具有较宽的动态范围。在CSMC 0.5μm2PTMCMOS工艺下
用Spectre仿真器对电路进行了模拟
仿真结果表明:传感电流范围为20 pA~20μA
动态范围可达120 dB。
Abstract
A CMOS potentiostat based on three-electrode amperometric chemical sensor is designed.The circuit is formed by the control amplifier
current-mirror and the single-ended OTA.Compared with the traditional design
this structure has several advantages
for example the power consumption is lower
the layout area is smaller and the range of sensing current is wider.Simulation is carried out with 0.5 μm CMOS process by Spectre emulator
the current-sensing range is from 20 pA ~20 μA.Dynamic range is 120 dB.