A Magnetic-Balanced Inductive Link for the Simultaneous Uplink Data and Power Telemetry
AbstractWhen using the conventional two-coil inductive link for the simultaneous wireless power and data transmissions in implantable biomedical sensor devices, the strong power carrier could overwhelm the uplink data signal and even saturate the external uplink receiver. To address this problem, we propose a new magnetic-balanced inductive link for our implantable glaucoma treatment device. In this inductive link, an extra coil is specially added for the uplink receiving. The strong power carrier interference is minimized to approach zero by balanced canceling of the magnetic field of the external power coil. The implant coil is shared by the wireless power harvesting and the uplink data transmitting. Two carriers (i.e., 2-MHz power carrier and 500-kHz uplink carrier) are used for the wireless power transmission and the uplink data transmission separately. In the experiments, the prototype of this link achieves as high as 65.72 dB improvement of the signal-to-interference ratio (SIR) compared with the conventional two-coil inductive link. Benefiting from the significant improvement of SIR, the implant transmitter costs only 0.2 mW of power carrying 50 kbps of binary phase shift keying data and gets a bit error rate of 1 × 10
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Gong, C.; Liu, D.; Miao, Z.; Li, M. A Magnetic-Balanced Inductive Link for the Simultaneous Uplink Data and Power Telemetry. Sensors 2017, 17, 1768.
Gong C, Liu D, Miao Z, Li M. A Magnetic-Balanced Inductive Link for the Simultaneous Uplink Data and Power Telemetry. Sensors. 2017; 17(8):1768.Chicago/Turabian Style
Gong, Chen; Liu, Dake; Miao, Zhidong; Li, Min. 2017. "A Magnetic-Balanced Inductive Link for the Simultaneous Uplink Data and Power Telemetry." Sensors 17, no. 8: 1768.
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