An efficient RF power transfer and bidirectional data transmission to implantable electronic devices

Djemouai, A.; Slamani, M.

doi:10.1109/iscas.1999.780691

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…A growing interest for the development of electronic system based on radio-frequency identification (RFID) systems has already existed for several years [1][2][3][4][5][6][7][8][9][10]. RFID allows to identify numerous products and for example helps to improve inventory management through the reduction of out-of-stock items.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately this adds into the demodulation chain a high pass filter with a −3dB corner frequency about 450 kHz; consequently the amplitude of the signal modulation is unluckily attenuated. In [7] another signal rectifier is proposed. The system is also based on voltage to current transformation of the high voltage across the antenna (tag antenna in [7]).…”

Section: Introductionmentioning

confidence: 99%

“…In [7] another signal rectifier is proposed. The system is also based on voltage to current transformation of the high voltage across the antenna (tag antenna in [7]). The voltage is transformed into a current after a traditional diode rectifier.…”

Section: Introductionmentioning

confidence: 99%

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13.56 MHz CMOS transceiver for RFID applications

Meillere

Barthélémy

Martin³

2006

Analog Integr Circ Sig Process

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An Amplitude Shift Keying (ASK) transceiver for RFID applications is presented in this paper. The proposed transceiver is suitable for communications with electronic devices that are powered through an inductive link. The circuit has been designed to be compatible with the communication standards ISO 14443. It operates at 13.56 MHz with a communication speed from 200 kHz up to 847 kHz. In modulation mode of operation, a solution based on programmable CMOS inverters is proposed to control the modulation depth in the range [0-100%]. The demodulator has been designed using versatile current rectifier and a simple operational transconductance amplifier stage. The proposed transceiver was implemented in a standard 0.5 µm CMOS process. The circuit covers an area of 2 mm 2 and the total DC power consumption is lower than 5.3 mW under 4V DC supply voltage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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13.56 MHz CMOS transceiver for RFID applications

Meillere

Barthélémy

Martin³

2006

Analog Integr Circ Sig Process

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“…This is compatible with high-efficiency class D or E transmitter configurations [7,81. The carrier frequency is 6.78MHz which coincides with one of the ISM (industrial, scientific and medical) bands.…”

Section: Thelinkmentioning

confidence: 86%

A distributed transducer system for functional electrical stimulation

Gudnason

Nielsen

Bruun

et al.

ICECS 2001. 8th IEEE International Conference on Electronics, Circuits and Systems (Cat. No.01EX483)

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“…The on-chip active transmitter is used to transmit the digitized data to the external receiver. Because the bandwidth of this transmitter sets the limit for recording data transmission, it is desirable to have a carrier frequency as high as possible [12,13]. The functions of the control logic include decoding the received commands from the front-end, selecting the corresponding probe and channel, controlling A/D and the internal transmitter.…”

Section: Introductionmentioning

confidence: 99%

Circuitry for a wireless microsystem for neural recording microprobes

Najafi

2001 Conference Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Abstract-Integrated circuits for use in a wireless microsystem used in neural recording is described. The implantable microsystem will be powered and transmit digitized data using RF telemetry. Recorded neural signals are amplified, multiplexed, digitized using a 2 nd order sigma-delta modulator, and then transmitted to the outside world by an on-chip transmitter. The circuit is designed using a standard 1.5µm CMOS process. Several circuit blocks have been desgigned, fabricated and show to operate as expected. Keywords -Telemetry, Microsystem, Sigma-delta, Microprobe I. INTRODUCTIONDirect recording of neural activity has been longed for by physiologists and scientists in order to unveil the secrets of biological neural networks, which may inspire the innovations in artificial intelligence, human physiology and biomedical prosthesis.The silicon micromachined microelectrode developed at the University of Michigan is one of the successful approaches to record the neural signals from the central and peripheral nerve systems [1]-[3,] and some efforts have been made to accomplish the above goal [4]- [6]. A low-power, wireless prototype of an integrated circuit chip is being developed for an implantable multichannel recording microprobe for central nervous system. The integrated circuit chip is powered using RF telemetry by an external coil that is separated from the receiver coil by a distance of several millimeters. The chip allows recording of ±500 µV neural signals from axons regenerated through a micromachined silicon sieve electrode. These signals are amplified using pre-amplifiers, multiplexed, digitized with a 10-bit sigma-delta modulator, and then transmitted to the outside world using an on-chip transmitter. The circuit is designed using a standard 1.5µm CMOS process. It is obvious that inductive RF power delivery and data transmission are desired in the design of the implanted recording microsystem to reduce potential hazards of interconnect wires and batteries to tissues in chronic recording applications. One of the main challenges of the required system is to transfer sufficient power to the implant and produce clean power supply needed for high-resolution recording and conversion to digital format of the recorded data.II. SYSTEM OVERVIEW The IC block diagram, shown in Fig. 1, illustrates the operation of the telemetry system.A. Front-end circuitry The front-end circuitry includes circuit blocks of voltage regulators, clock recovery, ASK demodulator, power-onreset and RF limiter [7,8].The front-end circuitry receives power and commands from the external transmitter so as to keep the implanted chip functional. It also recovers clock and reset signals for digital blocks as well as protect the on-chip electronics from high RF voltage. However, RF power delivery may introduce high power supply noise to the implanted chip, which may be much higher than 0.1% required by 10 bit resolution. In order to achieve the high resolution, over-sampling method is chosen to implement the ADC [9,10]. In this application, a s...

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An efficient RF power transfer and bidirectional data transmission to implantable electronic devices

Cited by 10 publications

References 6 publications

13.56 MHz CMOS transceiver for RFID applications

13.56 MHz CMOS transceiver for RFID applications

A distributed transducer system for functional electrical stimulation

Circuitry for a wireless microsystem for neural recording microprobes

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