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

作者：Liu, Lianxi^*; Zhang, Yi; Song, Yu; Zhu, Zhangming; Yang, Yintang

来源：MICROELECTRONICS JOURNAL, 2017, 70: 52-62.

DOI：10.1016/j.mejo.2017.10.007

• Wireless body area network
• Low-voltage
• Amplifier
• Low-noise
• Low-power
• Current reuse

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.

• 出版日期2017-12
• 单位西安电子科技大学