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A current-reuse dual-channel bio-signal amplifier for WBAN nodes

Author:
Liu, Lianxi  Zhang, Yi  Song, Yu  Zhu, Zhangming  Yang, Yintang  


Journal:
MICROELECTRONICS JOURNAL


Issue Date:
2017


Abstract(summary):

This paper presents a dual-channel low-noise bio-signal amplifier for the low-power wireless body area network (WBAN) nodes. A dual-channel three-input current-reuse (DTCR) structure is proposed to optimize the noise performance of amplifier. The chopper-stabilized technique is employed to reduce 1/f noise and the offset voltage. Moreover, a high input impedance is achieved by using the pre-charge technique. In addition, a DC offset canceling loop is employed to suppress the electrode offset. The proposed amplifier is implemented in a standard 0.18 mu m CMOS process with an active area of about 0.68 x 0.73 mm(2). The experimental results demonstrate that an input referred noise of 1.12 mu V-rms has been achieved over a bandwidth from 0.35 Hz to 150 Hz. The total power consumption of each channel is about 1.44 mu W at the supply voltage of 1.2 V. And the amplifier achieves an input impedance of about 200 M Omega, a CMRR of 111 dB at 50 Hz and a PSRR of 87.5 dB at 50 Hz.


Page:
52---62


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