Journal ArticleDOI
Power-Efficient Impedance-Modulation Wireless Data Links for Biomedical Implants
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TLDR
An experimental realization of a bidirectional half-duplex link that uses near-field inductive coupling between the implanted system and an external transceiver is described, making it among the most power-efficient inductive data links reported.Abstract:
We analyze the performance of wireless data telemetry links for implanted biomedical systems. An experimental realization of a bidirectional half-duplex link that uses near-field inductive coupling between the implanted system and an external transceiver is described. Our system minimizes power consumption in the implanted system by using impedance modulation to transmit high-bandwidth information in the uplink direction, i.e., from the implanted to the external system. We measured a data rate of 2.8 Mbps at a bit error rate (BER) of <10-6 (we could not measure error rates below 10-6 ) and a data rate of 4.0 Mbps at a BER of 10-3. Experimental results also demonstrate data transfer rates up to 300 kbps in the opposite, i.e., downlink direction. We also perform a theoretical analysis of the bit error rate performance. An important effect regarding the asymmetry of rising and falling edges that is inherent to impedance modulation is predicted by theory and confirmed by experiment. The link dissipates 2.5 mW in the external system and only 100 muW in the implanted system, making it among the most power-efficient inductive data links reported. Our link is compatible with FCC regulations on radiated emissions.read more
Citations
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Journal ArticleDOI
Circuits for a Cubic-Millimeter Energy-Autonomous Wireless Intraocular Pressure Monitor
Mohammad Hassan Ghaed,Gregory K. Chen,Razi-ul Haque,Michael Wieckowski,Yejoong Kim,Gyouho Kim,Yoonmyung Lee,Inhee Lee,David Fick,Daeyeon Kim,Mingoo Seok,Kensall D. Wise,David Blaauw,Dennis Sylvester +13 more
TL;DR: Continuous measurement can be achieved with an implanted monitor to improve treatment regiments, assess patient compliance to medication schedules, and prevent unnecessary vision loss.
Proceedings ArticleDOI
A cubic-millimeter energy-autonomous wireless intraocular pressure monitor
Gregory K. Chen,Hassan Ghaed,Razi-ul Haque,Michael Wieckowski,Yejoong Kim,Gyouho Kim,David Fick,Daeyeon Kim,Mingoo Seok,Kensall D. Wise,David Blaauw,Dennis Sylvester +11 more
TL;DR: Circuit blocks for a 1.5 mm3 microsystem enable continuous monitoring of intraocular pressure at nanowatt power levels not completely explored before and achieves zero-net-energy operation with 2.5 hours of sunlight or 10 hours of bright indoor lighting daily.
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A 13.56 MHz Wireless Power Transfer System With Reconfigurable Resonant Regulating Rectifier and Wireless Power Control for Implantable Medical Devices
TL;DR: Two novel backscattering uplink techniques are proposed for fast and energy-efficient data feedback for general data transmission using Manchester code and for fast duty cycle feedback to cater for fast load-transient responses.
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The Design of CMOS Radio-Frequency Integrated Circuits
TL;DR: In this paper, the authors present a solution manual for the design of radio frequency integrated circuits (RFIC) solution manual, which can be found in the ePUB format.
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A Low-Power Integrated Circuit for a Wireless 100-Electrode Neural Recording System
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TL;DR: A prototype integrated circuit for wireless neural recording from a 100-channel microelectrode array was developed and a two-chip system was used to record neural signals from a Utah Electrode Array in cat cortex and transmit the digitized signals wirelessly to a receiver.
Journal ArticleDOI
Fully integrated passive UHF RFID transponder IC with 16.7-/spl mu/W minimum RF input power
U. Karthaus,M. Fischer +1 more
TL;DR: A novel fully integrated passive transponder IC with 4.5- or 9.25-m reading distance at 500-mW ERP or 4-W EIRP base-station transmit power, operating in the 868/915-MHz ISM band with an antenna gain less than -0.5 dB.
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