Design of Low Power Low Noise Amplifier for Portable Electrocardiogram Recording System Applications
Electrocardiogram (ECG) signals have the characterristics of low amplitude and low frequency. A low-power, lownoise and low voltage amplifier is required for long term ECG signals monitoring. Chopping technique is an efficient approach to decrease the 1/f noise of CMOS amplifiers, but conventional chopper amplifier consumes large power because it required a wide-band amplifier exceed chopping frequency and a post lowpass filter to filter modulation noise. Moreover, the DC offset created by skin-electrode interface can reach as high as ±100mV and can easily saturate the amplifier, which limits the amount of gain applied to amplifiers. In this paper, an amplifier with low power, low noise and electrode dc offset suppression is presented for ECG recording system applications. The main amplifier is a chopper amplifier without post low-pass filter, which can reduce power consumption. The complete amplifier configured with the low power chopper amplifier can suppress the electrode dc offset effectively. The circuit of the presented amplifier is designed in TSMC 0.18μm 1P4M CMOS process. The achieved input integrated referred noise voltage is 0.68μV rms from 0.1Hz to 150Hz with high CMRR of 107dB. The power consumption is 46.8 μW with ±0.9V supply.
Electrocardiogram signals 1/f noise low-pass filter chopper amplifier electrode dc offset
Xiao Yang Qi Cheng Li-fei Lin Wei-wei Huang Chao-dong Ling
College of Information Science and Engineering, Huaqiao University, Xiamen, 361021, China Key Laboratory of ASIC and System of Xiamen, Xiamen, 36021, China
国际会议
厦门
英文
89-92
2011-06-24（万方平台首次上网日期，不代表论文的发表时间）