New low noise interface circuit for detecting weak current of micro-sensors

作     者：谭晓昀 孙明 王佳琪 尹亮 刘晓为 

作者机构：MEMS CentreHarbin Institute of Technology Key Laboratory of Micro-Systems and Micro-Structures ManufacturingMinistry of Education Δθ is the error phase-transformationcaused by the charge amplifier Bruun E. "CMOS current conveyors"in Circuits and Sys-tems Tutorials. New York: IEEE Press1996. 632 - 640..12.New low noise interface circuit for detecting weak current of micro-sensors 

出 版 物：《Journal of Harbin Institute of Technology(New Series)》 (哈尔滨工业大学学报（英文版）)

年 卷 期：2011年第18卷第4期

页      面：9-12页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：Sponsored by the National High Technology Research Development Plan of China(Grant No.2008AA042201) 

主　　题：micro-sensor weak signal detection phase error low noise 

摘      要：A new low noise interface circuit for detecting weak current of micro-sensors is *** using the transimpedance amplifier to substitute the charge amplifier,the closed-loop circuit can avoid the phase error of the charge ***,the phase compensation devices will be cancelled,because there is no phase transformation through the transimpedance *** well as,by using CCCII devices to implement the high value feedback resistor of the impedance amplifier,the noise of the I-V transformation devices is reduced,comparing with the passive *** floating resistor is easy to be integrated into chips,making the integration of the interface circuit of the intelligent sensors *** the simulation,the phase error of the charge amplifier is almost 9°at 2 kHz and it changes with the working frequency of the micro-sensors making the phase compensation not *** value of the floating resistor is 250 kΩ where the bias current is 50 μ*** noise of the active resistor is 0.037 fV2/Hz,comparing with the noise of the passive resistor,which is 4.14 fV2/Hz.