Remotely powered PPM demodulator by inductive coupling for rodent applications

Catherine Dehollain, Enver Gürhan Kilinç, Franco Maloberti, Kerim Türe
Springer Verlag, 2016
Article

Résumé

A low-power pulse position modulation (PPM) demodulator has been developed for remotely powered batteryless implantable devices. The required power for the implantable device is provided by the magnetic coupling with the external array of powering of coils placed under the living space of the animal. The remote powering is turned off 6 % of one bit duration during data transmission. The remote powering link is optimized to deliver power at 13.56 MHz frequency. The power is transferred from 30 mm distance with 21 % efficiency. An integrated full-wave rectifier and voltage regulator generate 1.8 V supply voltage from induced signal. The integrated PPM demodulator consumes only 27.8 lW and has 8.33 kb/s data rate. The presented entire system and basic blocks are integrated using a 0.18 mu m CMOS technology. Experimental results verify the effectiveness of the PPM demodulator and the downlink communication system.

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https://infoscience.epfl.ch/record/222327?ln=fr

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Catherine Dehollain, Enver Gürhan Kilinç, Franco Maloberti, Kerim Türe
Springer Verlag, 2016
Article

Résumé

Official source

https://infoscience.epfl.ch/record/222327?ln=fr

À propos de ce résultat

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Wireless Data and Power Transmission Aiming Intracranial Epilepsy Monitoring

Oguz Atasoy, Catherine Dehollain, Gürkan Yilmaz

This study presents a wireless power and data transmission system to overcome the problems in intracranial epilepsy monitoring associated with transcutaneous wires. Firstly, a wireless power transfer link based on inductive coupling is implemented and a power management unit for the implant is designed. 4-coil resonant inductive link scheme is exploited since it exhibits a high efficiency and optimal load flexibility. Power management unit consists of an active rectifier, a low drop-out voltage regulator which is biased internally with a supply independent current source; all implemented as integrated circuit. Wireless power link provides 10 mW under 1.8 V dc to the load, more specifically the electrodes and read-out electronics. Wireless data communication is realized using the same frequency, 8.4 MHz, as the power link. Load shift keying is performed for uplink (from implant to external) communication by switching an integrated modulator which, in fact, detunes the resonance. Modulated signal is recovered on the external device by means of an integrated self-referenced ASK demodulator. Data rate is adapted for a fast ripple (< 500 Hz) detection system which requires 300 kbps communication. The measurements show that the system works at 36% power transfer efficiency without communication link and the efficiency drops to 33% with 300 kbps uplink data transfer. Finally, in-vitro tests that emulate the real operation scenario are performed thanks to the two-polymer packaging and almost the same power transfer efficiency is achieved under same operation conditions.

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A Low-Power PPM Demodulator for Remotely Powered Batteryless Implantable Devices

Catherine Dehollain, Enver Gürhan Kilinç, Franco Maloberti

A low-power PPM demodulator has been developed for remotely powered batteryless implantable devices. The required power is harvested by the magnetic coupling with external powering coils placed under the living space of the animal. The remote powering is turned off only 1% of a bit duration during data transmission. The PPM demodulator consumes only 22.7 mu W at 1.8 V and has 5.55 kb/s data rate. Entire system and basic blocks integrated using a 0.18 mu m CMOS technology are presented. Experimental results show the effectiveness of the PPM demodulator and the communication system.

Ieee2014

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A Low Power On-Chip Class-E Power Amplifier For Remotely Powered Implantable Sensor Systems

Catherine Dehollain, Enver Gürhan Kilinç, Kerim Türe

This paper presents a low power fully integrated class-E power amplifier and its integration with remotely powered sensor system. The class-E power amplifier is suitable solution for low-power applications due to its high power efficiency. However, the required high inductance values which make the on-chip integration of the power amplifier difficult. The designed power amplifier is fully integrated in the remotely powered sensor system and fabricated in 0.18 mu m CMOS process. The power is transferred to the implantable sensor system at 13.56 MHz by using an inductively coupled remote powering link. The induced AC voltage on the implant coil is converted into a DC voltage by a passive full-wave rectifier. A voltage regulator is used to suppress the ripples and create a clean and stable 1.8 V supply voltage for the sensor and communication blocks. The data collected from the sensors is transmitted by on-off keying modulated low-power transmitter at 1.2 GHz frequency. The transmitter is composed of a LC tank oscillator and a fully on-chip class-E power amplifier. An additional output network is used for the power amplifier which makes the integration of the power amplifier fully on-chip. The integrated power amplifier with 0.2 V supply voltage has a drain efficiency of 31.5% at -10 dBm output power for 50 Omega load. The measurement results verify the functionality of the power amplifier and the remotely powered implantable sensor system. The data communication is also verified by using a commercial 50 Omega chip antenna and has 600 kbps data rate at 1 m communication distance.

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