A Sub-10-pJ/bit 5-Mb/s Magnetic Human Body Communication Transceiver
A Sub-10-pJ/bit 5-Mb/s Magnetic Human Body Communication Transceiver
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DOI：
10.1109/jssc.2019.2935549
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发表时间：
2019-11-01
影响因子：
5.4
通讯作者：
Mercier, Patrick P.
中科院分区：
文献类型：
--
作者：
Park, Jiwoong;Mercier, Patrick P.
本文介绍了一种收发器，旨在利用磁人体通信（mHBC）提供的低路径损耗，实现超高效的体域网络。一种单级功率振荡器用于通过身体佩戴的线圈有效地产生开关键控（OOK）调制磁场，所述身体佩戴的线圈充当谐振元件和磁场产生元件。为了解耦改善的路径损耗，同时降低数据速率与线圈的Q增加的折衷，提出了同步注入锁定的踢启动电路，其在40 MHz的载波频率下实现5 Mb/s的数据，其中Q类似于50，并且还提供动态频率调谐以补偿运动期间的正常电感器变化。接收机（RX）利用低路径损耗的低功耗亚阈值偏置动态阈值放大器和包络检测器的设计，并成功地执行接收到的OOK数据的非相干解调。发射器和接收器消耗18.56和6.3 μ W，当包括用于参考时钟的17.2 μ W晶体振荡器时，在闭合穿过身体的链路时，其效率分别为7.15和4.7 pJ/bit。
This article presents a transceiver designed to exploit the low path loss offered by magnetic human body communication (mHBC) toward ultra-efficient body area networking. A single-stage power oscillator is used to efficiently generate on-off-keying (OOK) modulated magnetic fields via body-worn coils that act as both resonant and magnetic-field-generating elements. To de-couple improved path loss yet reduced data-rate tradeoffs with increasing Q of coils, a synchronous injection-locked kick-start circuit is proposed, enabling 5-Mb/s data at a carrier frequency of 40 MHz with Q of similar to 50 and also providing dynamic frequency tuning to compensate normal inductor variation during motion. The receiver (RX) exploits the low path loss toward the design of a low-power sub-threshold-biased dynamic-threshold amplifier and envelope detector and successfully performs non-coherent demodulation of received OOK data. The transmitter and RX consume 18.56 and 6.3 mu W, which when including a 17.2-mu W crystal oscillator for the reference clock, results in an efficiency of 7.15 and 4.7 pJ/bit, respectively, when closing a link across the body.