System Design of a Low-power Wireless Link for Neural Recording in a Visual Prosthesis

Omisakin, Adedayo; Mestrom, Rmc Rob; Bentum, Mark J.

doi:10.1109/africon46755.2019.9133916

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…This is because its demodulator uses digital components. This fits the overall goal of low-power consumption and data rate required for the visual prosthesis [4]. However, to further enhance its robustness to errors, we propose the following three novelties to in the system.…”

Section: Introductionmentioning

confidence: 99%

Low-Power BPSK Inductive Data Link for an Implanted Intracortical Visual Prosthesis

Omisakin

Mestrom

Bentum

2019

2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

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Section: Introductionmentioning

confidence: 99%

Low-Power BPSK Inductive Data Link for an Implanted Intracortical Visual Prosthesis

Omisakin

Mestrom

Bentum

2019

2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

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“…Furthermore, a current-controlled variable oscillator is proposed to tune the number of pulses per bit. The transmitter is built using predominantly digital components to strive towards low power consumption while delivering a high data rate (a minimum of 23 Mbps is required [13]). The potential of digital-based designs is discussed in [14,15], which is beneficial to low-power transceivers.…”

Section: Introductionmentioning

confidence: 99%

“…Transmission data rate: It is required to transmit a minimum of 23 Mbps for compressed data with electrode recordings [13]. The receiver is required to handle a minimum of 200 kbps of stimulation data [19].…”

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confidence: 99%

Sub-Milliwatt Transceiver IC for Transcutaneous Communication of an Intracortical Visual Prosthesis

et al. 2021

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An intracortical visual prosthesis plays a vital role in partially restoring the faculty of sight in visually impaired people. Reliable high date rate wireless links are needed for transcutaneous communication. Such wireless communication should receive stimulation data (downlink) and send out neural recorded data (uplink). Hence, there is a need for an implanted transceiver that is low-power and delivers sufficient data rate for both uplink and downlink. In this paper, we propose an integrated circuit (IC) solution based on impulse radio ultrawideband using on-off keying modulation (OOK IR-UWB) for the uplink transmitter, and binary phase-shift keying (BPSK) with sampling and digital detection for the downlink receiver. To make the solution low-power, predominantly digital components are used in the presented transceiver test-chip. Current-controlled oscillators and an impulse generator provide tunability and complete the on-chip integration. The transceiver test-IC is fabricated in 180 nm CMOS technology and occupies only 0.0272 mm2. At 1.3 V power supply, only 0.2 mW is consumed for the BPSK receiver and 0.3 mW for the IR-UWB transmitter in the transceiver IC, while delivering 1 Mbps and 50 Mbps, respectively. Our link budget analysis shows that this test chip is suitable for intracortical integration considering the future off-chip antennas/coils transcutaneous 3–7 mm communication with the outer side. Hence, our work will enable realistic wireless links for the intracortical visual prosthesis.

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Optimal Frequency for Biomedical Wireless Power Transfer

Nunen,

Mestrom,

Visser

2023

Preprint

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When power is to be transferred to a mm-sized \gls{imd}, located multiple cm deep inside the human body, the main goal is often to maximize the received power, within the applicable \gls{sar} limits. It has been shown that, for equivalent homogeneous biological tissue, there is little difference between the received power using \gls{wpt} at (sub-)GHz frequencies compared to low MHz frequencies. However, it remains unclear whether the introduction of additional tissue layers, thus more accurately approximating the real environment, changes the optimal frequency for maximum received power. This paper presents an analytical model that can be used to calculate the \gls{em} fields, \gls{sar}, received power, and \gls{pte} in a planarly layered environment, consisting of an arbitrary number of layers with arbitrary thicknesses and arbitrary dielectric properties. The model is first validated by comparing it to CST Studio Suite\textregistered. It is then used to determine the optimal frequency for \gls{wpt} to a mm-sized implant, located multiple cm deep inside the human body. The optimal frequency is 10 kHz, and the received power is approximately constant up to 300 kHz. The same holds for the \gls{pte}.

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System Design of a Low-power Wireless Link for Neural Recording in a Visual Prosthesis

Abstract: System design of a low-power wireless link for neural recording in a visual prosthesis.

Cited by 4 publications

References 13 publications

Low-Power BPSK Inductive Data Link for an Implanted Intracortical Visual Prosthesis

Low-Power BPSK Inductive Data Link for an Implanted Intracortical Visual Prosthesis

Sub-Milliwatt Transceiver IC for Transcutaneous Communication of an Intracortical Visual Prosthesis

Optimal Frequency for Biomedical Wireless Power Transfer

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