JSSC 2022第3期RF & Wireless180nmNeural Interface

A Wireless Somatosensory Feedback System Using Human

基于人体通信的无线体感反馈系统，用于瘫痪手部触觉恢复

180nm CMOS, 36.4 pJ/bit, 60 pJ/bit, 1.2 Mbps

人体通信体感反馈神经刺激OOK接收器FSK接收器

▸创新点1：采用人体通信技术实现高效无线链接（系统创新）。通过利用低损耗的人体信道，实现了多个高效无线链接，显著降低了能量消耗和系统复杂度，适用于可穿戴设备。

▸创新点2：自干扰容忍的OOK接收器设计（电路创新）。采用mixer-first架构，实现了71-dB的自干扰抑制能力，在-61-dBm输入RF功率下，能耗仅为36.4 pJ/bit，面积仅为0.065 mm²。

▸创新点3：温度稳定的FSK接收器设计（电路创新）。基于注入锁定松弛振荡器，实现了0.17 mm²的小面积和60 pJ/bit的低能耗，在1.2 Mbps数据速率和2.2 MHz FSK电平差下稳定工作。

▸创新点4：可重构功率/FSK发射器和电荷平衡神经刺激器设计（系统创新）。提供了灵活的发射模式和安全的神经刺激方案，进一步增强了系统的实用性和可靠性。

Abstract

This article presents the ﬁrst integrated somatosensory feedback system based on human body communication (HBC). The proposed wireless system, which is implemented using a 180-nm CMOS process, composed of a wrist device, a brain stimulator device (BSD), and an artiﬁcial mechanoreceptor, is designed to restore the sense of touch to a paralyzed hand through tactile sensing and neural stimulation. By utilizing the HBC technique, multiple highly efﬁcient wireless links are realized through the low loss body channel. The self-interference tolerant mixer-ﬁrst on–off keying (OOK) receiver (RX) achieves 71-dB self-interference rejection at −61-dBm input RF power, with an energy consumption of 36.4 pJ/bit and an area of 0.065 mm 2. The temperature-stable, 0.17-mm2 injection locked relaxation oscillator-based frequency- shift keying (FSK) RX achieves an energy consumption of 60 pJ/bit at an input data-rate of 1.2 Mbps and an FSK level difference of 2.2 MHz. A reconﬁgurable power/FSK transmitter (TX) and a charge-balanced neural stimulator are also presented. The wireless system was demonstrated and veriﬁed on human body.