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《Microelectronics》 2016-01
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A Chopper Stabilized Preamplifier for ECG Signal Acquisition

DUAN Jihai;HAO Qiangyu;XU Weilin;WEI Baolin;Guangxi Key Laboratory of Precision Navigation Technology and Application,Guilin University of Electronic Technology;  
A low-voltage low-power low-noise and high common-mode rejection ratio(CMRR)chopper stabilized differential difference preamplifier was presented for electrocardiogram(ECG)signal acquisition.The proposed circuit contained a bias circuit,a main amplifier and a clock generation circuit,and the clock circuit contained a relaxation oscillator and a non-overlapping clock generator.Chopper stabilized technique was used to reduce the 1/f noise at low frequency.Differential difference input and cross-coupling were used to get high CMRR.T-network capacitor feedback was used to reduce chip area.So the amplifiers performances had been optimized.This circuit was designed in SMIC 0.18μm 1P6 M CMOS process,and was simulated with PSS,PAC,PNOISE.The results showed that the amplifier consumed a total current of only 35μA with a supply voltage of 1.8V,and achieved an AC gain of 40.6dB,a high CMRR of 115 dB,a low input referred noise of 950nV(rms)from 0.01 Hz to 100 Hz.It could be an attractive candidate for ECG signal acquisition.
【Fund】: 国家自然科学基金资助项目(61161003 61264001 61166004);; 广西自然科学基金资助项目(2013GXNSFAA019333)
【CateGory Index】: TN722.71
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