An implantable bi-directional wireless transmission system for transcutaneous biological signal recording

Liang, Chih-Kuo; Chen, Jia-Jin Jason; Chung, Cho-Liang; Cheng, Chen-Li; Wang, Chua-Chin

doi:10.1088/0967-3334/26/1/008

Cited by 43 publications

(24 citation statements)

References 30 publications

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“…Showing efficiencies of 80-100%, class-E power amplifiers are suitable for various applications wherein the transmitter and receiver exhibit very weak coupling. The reader recovers the recorded biological signal and transmits the data through LSK back telemetry to the external transceiver system for further data processing [5,[7][8][9][10][11][12]. LSK is the most common technique for data transmission from transponders back to the readers.…”

Section: Transceiver System Architecturementioning

confidence: 99%

“…However, this scheme has a trade off in shorter transmission range compared to analog frequency modulation (FM) due to power limitations of the implanted module [5]. To reduce the effects of interference induced by the 2 MHz carrier signal, previously published designs' implant modules uses two separate coils to perform the necessary two-way data transmission [5,11,12].…”

Section: Transceiver System Architecturementioning

confidence: 99%

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A 2 MHz Wireless CMOS Transceiver for Implantable Biosignal Sensing Systems

Albason

Chung

Lou

2010

J Sign Process Syst

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An implementation of an implantable sensing biosystem composes of a readout circuit, a power management block, an embedded microcontroller unit (MCU), an implantable drug delivery section and a wireless uplink transceiver system. This paper describes a bi-directional wireless transceiver system for implantable sensing systems. The transceiver system is composed of an external and implantable transceiver, communicating through an inductive link. Half duplex communication between transceivers at a 10 Kbps data rate was achieved at a maximum distance of 4 cm. Command and data will be supplied to the implantable module by radio frequency (RF) telemetry utilizing an amplitude shift keying (ASK) modulated 2 MHz carrier frequency. A capacitor-less amplitude demodulation receiver architecture was produced in the research with implantable receiver core area measuring at 113.2 µm by 171.8 µm with average power dissipation at 815.1 µW at a 3.3 V single rail power supply. An active uplink transceiver utilizing load shift keying (LSK) as backward data telemetry was designed. Implantable transmitter core area measures 251.7 µm by 139.3 µm, consuming 103.62 mW while driving an RF ferrite core antenna at maximum reading range. Integrating both circuits, implantable transceiver, measuring 355.3 µm by 171.8 µm, was designed and implemented using TSMC 0.35 µm mixed-signal 2P4M 3.3 V standard CMOS process. The integrated circuit solution addressed solutions for many of the problems associated with implanted devices and introduces circuits which improve in several ways over previously published designs, in functionality and integration level. In addition to being fully integrated in plain CMOS technology, not relying at least partly on available specialized elements and expensive technologies, these building blocks improve on previous designs in performance and/or power consumption. This work succeeded in implementing building blocks for an implantable transceiver, which depends only on the absolute minimum off-chip components. A complete implantable chip is presented, which highlight the design tradeoffs and optimizations applied to the design of CMOS implantable system chips.

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Section: Transceiver System Architecturementioning

confidence: 99%

Section: Transceiver System Architecturementioning

confidence: 99%

A 2 MHz Wireless CMOS Transceiver for Implantable Biosignal Sensing Systems

Albason

Chung

Lou

2010

J Sign Process Syst

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“…A lower carrier frequency can produce a slow and detrimental data transmission rate; however a higher frequency can cause excessive heating and damage body tissue. 2 MHz is between hundreds of kilohertz and few megahertz, the suggested range by researchers for implantable devices or bio microsystems [3] [4] [5].…”

Section: Downlink Transceiver Prototypementioning

confidence: 99%

A Low Power Wireless Downlink Transceiver for Implantable Glucose Sensing Biosystems

et al. 2009

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-A novel capacitor-less amplitude demodulation receiver architecture is used in the design of a downlink transceiver for a wireless implantable glucose sensing biosystem. The transceiver system is composed of a high efficiency class E power amplifier utilized as an external transmitter and an implantable data detection receiver, communicating through an inductive link. Amplitude shift keying digital scheme is used to externally modulate the 2 MHz carrier frequency at a data rate of 2 kbps. Transmitter spectral power was measured at 1.51 mW during transmission in air and data was successfully decoded at an effective distance of 3 cm between antennas. Implantable receiver off-chip antenna is implemented using a ferrite core, wire wound coil. A low power, low area consumption implantable receiver module is produced in the research with internal receiver core area measuring at 64.8μm by 55.9μm. Average power dissipation is 1.15 mW at a 3.3V single rail power supply, the lowest to date. Power consumption was measured at both 10 pF and 100 pF load capacitances. Implantable receiver chip was designed and implemented using a TSMC 0.35μm mixed-signal 2P4M 3.3V/5V standard CMOS process.

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“…FiniteState-Machine (FSM)-based systems [18], [19], [20] to more generic and software-based (µP /µC-based) ones [21], [22], [23]. This trend has been well-studied [16] and is depicted in Fig.1.…”

Section: Processorsmentioning

confidence: 99%

The case for a generic implant processor

Strydis

Gaydadjiev

2008

2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Abstract-A more structured and streamlined design of implants is nowadays possible. In this paper we focus on implant processors located in the heart of implantable systems. We present a real and representative biomedical-application scenario where such a new processor can be employed. Based on a suitably selected processor simulator, various operational aspects of the application are being monitored. Findings on performance, cache behavior, branch prediction, power consumption, energy expenditure and instruction mixes are presented and analyzed. The suitability of such an implant processor and directions for future work are given.

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An implantable bi-directional wireless transmission system for transcutaneous biological signal recording

Cited by 43 publications

References 30 publications

A 2 MHz Wireless CMOS Transceiver for Implantable Biosignal Sensing Systems

A 2 MHz Wireless CMOS Transceiver for Implantable Biosignal Sensing Systems

A Low Power Wireless Downlink Transceiver for Implantable Glucose Sensing Biosystems

The case for a generic implant processor

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