Feasibility Study on Active Back Telemetry and Power Transmission Through an Inductive Link for Millimeter-Sized Biomedical Implants
Feasibility Study on Active Back Telemetry and Power Transmission Through an Inductive Link for Millimeter-Sized Biomedical Implants
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DOI：
10.1109/tbcas.2017.2775638
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发表时间：
2017-12-01
影响因子：
5.1
通讯作者：
Ghovanloo, Maysam
中科院分区：
文献类型：
--
作者：
Yeon, Pyungwoo;Mirbozorgi, S. Abdollah;Ghovanloo, Maysam
本文介绍了一项通过感应链路向1 mm（2）植入物进行无线供电和数据传输的可行性研究，该植入物用作自由浮动的神经探针，分布在感兴趣的大脑区域。所提出的结构利用四线圈感应链路进行反向遥测，与三线圈链路共享用于无线电力传输。我们提出了一个设计过程中的几何优化的感应链路的功率传输效率（PTE）考虑特定的吸收率和数据速率。我们设计了一种低功耗基于脉冲的有源数据传输电路，并从数据速率和误比特率（BER）方面表征了所提出的感应链路的性能。使用直径为25 μ m的绝缘接合线实现1 mm（2）数据-Tx/功率-Rx线圈，当谐振器线圈内径为1 cm时，在131 MHz和1.8 cm线圈间隔距离下，组织介质中测得的PTE为2.01%。在空气和组织环境中，在1 Mbps数据速率下测得的BER分别为2.7 x 10（-6）和5 x 10（-6）。
This paper presents a feasibility study of wireless power and data transmission through an inductive link to a 1-mm(2) implant, to be used as a free-floating neural probe, distributed across a brain area of interest. The proposed structure utilizes a four-coil inductive link for back telemetry, shared with a three-coil link for wireless power transmission. We propose a design procedure for geometrical optimization of the inductive link in terms of power transmission efficiency (PTE) considering specific absorption rate and data rate. We have designed a low-power pulse-based active data transmission circuit and characterized performance of the proposed inductive link in terms of its data rate and bit error rate (BER). The 1-mm(2) data-Tx/power-Rx coil is implemented using insulated bonding wire with 25-mu m diameter, resulting in measured PTE in tissue media of 2.01% at 131 MHz and 1.8-cm coil separation distance when the resonator coil inner radius is 1 cm. The measured BER at 1-Mbps data rate was 2.7 x 10(-6) and 5 x 10(-6) in the air and tissue environments, respectively.