New low noise interface circuit for detecting weak current of micro-sensors |
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| Authors: | TAN Xiao-yun SUN-Ming WANG Jia-qi YIN Liang and LIU Xiao-wei |
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| Affiliation: | 1. MEMS Centre, Harbin Institute of Technology, Harbin 150001 ,China
2. MEMS Centre, Harbin Institute of Technology, Harbin 150001 ,China;Key Laboratory of Micro-Systems and Micro-Structures Manufacturing, Ministry of Education, Harbin 150001, China |
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| Abstract: | A new low noise interface circuit for detecting weak current of micro-sensors is designed.By using the transimpedance amplifier to substitute the charge amplifier,the closed-loop circuit can avoid the phase error of the charge amplifier.Therefore,the phase compensation devices will be cancelled,because there is no phase transformation through the transimpedance amplifier.As well as,by using CCCII devices to implement the high value feedback resistor of the impedance amplifier,the noise of the I-V transforma... |
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| Keywords: | micro-sensor weak signal detection phase error low noise |
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