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《Microelectronics》 2016-01
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A Current-Feedback Instrumentation Amplifier for ECG/EEG Acquisition

XU Naihao;JIANG Hanjun;WANG Wan;WANG Ziqiang;WANG Zhihua;Institute of Microelectronics,Tsinghua University;Beijing Engineering Research Center of Wireless Medical and Health Care(Tsinghua University);  
A low-power low-noise instrumentation amplifier(IA)dedicated for electrocardiogram(ECG)and electroencephalogram(EEG)acquisition systems was presented.A DC-coupled current-feedback structure was adopted.The output voltage range was expanded to rail-to-rail by adding a novel level shifting circuit between the forward amplifier and the feedback network.A background digitally-assisted offset calibration method was used to calibrate the differential electrode offset.The current-feedback IA was designed in a standard 0.18μm CMOS technology.The simulation results showed that the offset up to 3.1mV could be calibrated out under a gain setting of 57 dB.The input referred noise of the IA was 1.5μV(rms)at 0-100 Hz,which could meet the requirements for the ECG and EEG acquisition systems.The total operating current was only 1.7μA from a 1.8Vsupply.
【Fund】: 国家自然科学基金资助项目(61474070);; 清华大学自主科研项目(2012087960)
【CateGory Index】: R318;TN722
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