Isolator-less near-field RFID reader for sub-cranial powering/data link of mm-sized implants

Sutardja, Christopher; Rabaey, Jan M.

doi:10.1109/esscirc.2017.8094603

Cited by 2 publications

(1 citation statement)

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“…A large inverter must be used to match the 50 Ω antenna impedance, and significant power is consumed just to charge the input capacitor of the inverter driver. On the other hand, the throughput of backscattering TX is limited to a small fraction of the carrier frequency due to the narrowband modulation scheme, which is usually <10 Mb/s [10], [11]. The recently proposed PHM technique is promising to achieve high energy efficiency [12], [13], but it is difficult to extend its throughput to hundreds of Mb/s due to its on-off keying (OOK) modulation scheme.…”

Section: Introductionmentioning

confidence: 99%

A 200-Mb/s Energy Efficient Transcranial Transmitter Using Inductive Coupling

Wen

Duan

Rabaey

2019

IEEE Trans. Biomed. Circuits Syst.

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This paper presents an energy efficient wireless transmitter (TX) for neural implants. It utilizes inductive coupling with de-Q'ed TX inductor to achieve 200 Mb/s throughput. An ultra-low power injection-locked phase lock loop with background frequency calibration generates a clean 200-MHz TX clock from a 10-MHz reference. The TX chip is fabricated in TSMC 65-nm CMOS process, and the 10 × 10 mm 2 coupled inductors are implemented on two-layer printed circuit boards. A custom receiver is fabricated in the same CMOS process to facilitate measurements. The prototype transceiver achieves 5e-11 bit error rate (BER) over the 11.8-mm-thick skull of an eight-week primordial piglet carcass and <1e-12 BER over 11-mm air gap. The entire TX chip consumes 300 µW from a single 0.5 V supply. The energy efficiency of the TX is 1.5 pJ/b. Index Terms-Brain machine interface, biomedical implant, inductive coupling, injection locking, transcranial wireless links, ultra-low power transceiver.

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