期刊
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
卷 11, 期 6, 页码 1366-1376出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBCAS.2017.2775638
关键词
Free-floating neural interfacing probes; mm-sized implantable medical devices; pulse-based near-field transceiver; wireless power/data transmission
资金
- National Science Foundation [ECCS-1407880, ECCS-1408318]
- National Institutes of Health [1R21EB018561]
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.
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