Wireless Power and Data Link for Ensembles of Sub-mm scale Implantable Sensors near 1GHz
- Resource Type
- Conference
- Authors
- Lee, Jihun; Laiwalla, Farah; Jeong, Joonsoo; Kilfoyle, Chester; Larson, Lawrence; Nurmikko, Arto; Li, Siwei; Yu, Siyuan; Leung, Vincent W.
- Source
- 2018 IEEE Biomedical Circuits and Systems Conference (BioCAS) Biomedical Circuits and Systems Conference (BioCAS), 2018 IEEE. :1-4 Oct, 2018
- Subject
- Bioengineering
Components, Circuits, Devices and Systems
Relays
Wireless communication
Radio frequency
Wireless sensor networks
Couplings
Phantoms
System-on-chip
brain-machine interfaces
brain-computer interfaces
wireless power
implantable sensors
- Language
We describe a custom wireless power and data transmission (WPDT) link and analyze its performance in a prototype implantable sensor system of ensembles of CMOS sensor ASICs (“Neurograins”) embedding 0.5 mm × 0.5 mm planar microcoil antennas. We use near-field RF at ~1 GHz for wireless powering in a resonant 3-coil architecture including an implanted relay coil in a quadrant layout architecture to maximize coverage area and RF transfer efficiency. We demonstrate successful WPDT across antenna cross-section in benchtop proxy physiological tests. Demodulation and analysis of backscattered signals validate the data link fidelity. Our results suggest that this electromagnetic coupling scheme can robustly support a chip density of 250/ cm 2 (up to 1024 individual Neurograins in a 2 cm × 2 cm area) and parallel transmitters can be combined to multiply the channel capacity without destructive interference.