Low-Power Ultrawideband Wireless Telemetry Transceiver for Medical Sensor Applications

Gao, Yuan; Zheng, Yuanjin; Diao, Shengxi; Toh, Wei-Da; Ang, Chyuen-Wei; Je, Minkyu; Heng, Chun-Huat

doi:10.1109/tbme.2010.2097262

Cited by 139 publications

(64 citation statements)

References 9 publications

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“…HERE is growing demand for implant-to-air wireless links to extract the neural activity data gathered from implanted monitoring systems [1][2][3][4][5][6][7]. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Ultra-wideband (UWB) and 2.45 GHz ISM signals are transmitted in the unlicensed Federal Communications Commission (FCC) approved frequency ranges of 3.1-10.6 GHz and 2.4-2.5 GHz respectively. UWB offers several advantages over the conventional narrowband systems such as higher bit-rates, lower power consumption, smaller antennas, and less complexity on the transmitter side [5][6][7]. We design antennas supporting both 1) UWB signals for the high-bit-rate back telemetry link [7] of the neural recording sensor data and 2) 2.45GHz signals for low-bit-rate forward link [7] of control/stimulus signals.…”

Section: Introductionmentioning

confidence: 99%

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Flexible, Polarization-Diverse UWB Antennas for Implantable Neural Recording Systems

Bahrami¹,

Mirbozorgi²,

Ameli³

et al. 2016

IEEE Trans. Biomed. Circuits Syst.

118

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Abstract-Implanted antennas for implant-to-air data communications must be composed of material compatible with biological tissues. We design single and dual-polarization antennas for wireless ultra-wideband neural recording systems using an inhomogeneous multi-layer model of the human head. Antennas made from flexible materials are more easily adapted to implantation; we investigate both flexible and rigid materials and examine performance trade-offs. The proposed antennas are designed to operate in a frequency range of 2-11 GHz (having S 11 below -10dB) covering both the 2.45 GHz (ISM) band and the 3.1-10.6 GHz UWB band. Measurements confirm simulation results showing flexible antennas have little performance degradation due to bending effects (in terms of impedance matching). Our miniaturized flexible antennas are 12 mm × 12 mm and 10 mm × 9 mm for single-and dual-polarizations, respectively. Finally, a comparison is made of four implantable antennas covering the 2-11 GHz range: 1) rigid, single polarization, 2) rigid, dual polarization, 3) flexible, single polarization and 4) flexible, dual polarization. In all cases a rigid antenna is used outside the body, with an appropriate polarization. Several advantages were confirmed for dual polarization antennas: 1) smaller size, 2) lower sensitivity to angular misalignments, and 3) higher fidelity.

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“…HERE is growing demand for implant-to-air wireless links to extract the neural activity data gathered from implanted monitoring systems [1][2][3][4][5][6][7]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexible, Polarization-Diverse UWB Antennas for Implantable Neural Recording Systems

Bahrami¹,

Mirbozorgi²,

Ameli³

et al. 2016

IEEE Trans. Biomed. Circuits Syst.

118

View full text Add to dashboard Cite

show abstract

“…Previous squarers based on a passive self-mixer do not consume power but require an additional amplifier to obtain a conversion gain [2]. A squarer based on a pseudo-differential circuit consumes additional power to remove the dc offset of the output [3,4,5]. A squarer based on stacked NMOS and PMOS transistor pairs can save dc power consumption [6].…”

Section: Introductionmentioning

confidence: 99%

CMOS energy detector based on complementary squarer circuit for non-coherent UWB receiver

Kım

Kwon

2016

IEICE Electron. Express

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This letter presents a CMOS energy detector for a non-coherent ultra-wideband receiver. The proposed complementary squarer generates differential output using the NMOS and PMOS differential cascode stage with a common-mode feedback (CMFB) circuit. The squarer achieves high gain without DC offset using complementary squarer based on symmetrical NMOS and PMOS transistor pairs with very low power consumption. The proposed squarer with the integrator is designed using the 0.11-µm CMOS technology. The designed squarer with integrator operates at 3-5 GHz and only dissipate 1 mW at a supply voltage of 1.2 V.

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“…Unfortunately, most of the research related to the WCE's telemetry system has conducted with the random selection of the system's frequency without proper consideration of the propagation characteristics of the human body on the system's frequency [10]. In light of that, the following upgrades to the capsule-endoscopy system have been proposed: a lowpower, 3-5-GHz,ultra-wideband transceiver [11]; a 15-Mbps, 900-MHz ASK transmitter [12]; a 2.4-GHz, high-data-rate transceiver [13]; a 0.5-GHz, high-speed, high-efficiency system [14]; a 1.4-GHz conformal, ingestible, capsule antenna [15]; and a 2.4-GHz, peanut-shaped, printed antenna for the bio-telemetric tablet [16].…”

Section: Introductionmentioning

confidence: 99%

The Use of a Human Body Model to Determine the Variation of Path Losses in the Human Body Channel in Wireless Capsule Endoscopy

Basar¹,

Malek²,

Juni³

et al. 2013

PIER

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Abstract-Presently, wireless capsule endoscopy (WCE) is the sole technology for inspecting the human gastrointestinal (GI) tract for diseases painlessly and in a non-invasive way. For the further development of WCE, the main concern is the development of a highspeed telemetry system that is capable of transmitting high-resolution images at a higher frame rate, which is also a concern in the use of conventional endoscopy. A vital task for such a high-speed telemetry system is to be able to determine the path loss and how it varies in a radio channel in order to calculate the proper link budget. The hostile nature of the human body's channel and the complex anatomical structure of the GI tract cause remarkable variations in path loss at different frequencies of the system as well as at capsule locations that have high impacts on the calculation of the link budget. This paper presents the path loss and its variation in terms of system frequency and location of the capsule. Along with the guideline about the optimum system frequency for WCE, we present the difference between the maximum and minimum path loss at different anatomical regions, which is the most important information in the link-margin setup for highly efficient telemetry systems in next-generation capsules. In order to investigate the path loss in the body's channel, a heterogeneous human body model was used, which is more comparable to the human body than a homogenous model. The finite integration technique (FIT) in Computer Simulation Technology's (CST's) Microwave Studio was used in the simulation. The path loss was analyzed in the frequency range of 100 MHz to 2450 MHz. The path loss was found to be saliently lower at frequencies below 900 MHz. The smallest loss was found around the frequency of 450 MHz, where the variation of path loss throughout the GI tract was 29 dB, with a minimum of −9 dB and a maximum of −38 dB. However, at 900 MHz, this variation was observed to be 38 dB, with a minimum of −10 dB and a maximum of −48 dB. For most positions of the capsule, the path loss increased rapidly after 900 MHz, reaching its peak at frequencies in the range of 1800 MHz to 2100 MHz. During examination of the lower esophageal region, the maximum peak observed was −84 dB at a frequency of 1760 MHz. The path loss was comparatively higher during examination of anatomically-complex regions, such as the upper intestine and the lower esophagus as compared to the less complex stomach and upper esophagus areas.

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Low-Power Ultrawideband Wireless Telemetry Transceiver for Medical Sensor Applications

Cited by 139 publications

References 9 publications

Flexible, Polarization-Diverse UWB Antennas for Implantable Neural Recording Systems

Flexible, Polarization-Diverse UWB Antennas for Implantable Neural Recording Systems

CMOS energy detector based on complementary squarer circuit for non-coherent UWB receiver

The Use of a Human Body Model to Determine the Variation of Path Losses in the Human Body Channel in Wireless Capsule Endoscopy

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