Current-Mode Temporal Difference CMOS Imager for Capsule Endoscopy

Chan, Ho Yeung; Yuan, Jie

doi:10.1109/biocas.2007.4463348

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…However, much higher data rate is desirable for many new bio-medical sensors. A 64×64 implanted imaging sensor in the capsule endoscopy could generate data with 2Mbps data rate [4]. Wireless communication links at MHz are needed for neural recording [5].…”

Section: Introductionmentioning

confidence: 99%

High speed intra-body communication for personal health care

Zhu

Yuan

2009

2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Abstract-Intra-body communication (IBC) uses the conductive human body as the communication channel for data exchange. As the bio-sensor research is moving towards portable, wearable and implantable designs, IBC has significant potential applications for personal health care. Previous IBC research mainly focused on the electromagnetic (EM) IBC scheme, which resulted in low data rate (kbps). In this paper, we systematically studied the electric field (EF) IBC scheme, which enables 10Mbps data rate. The human body channel is thoroughly measured with attenuation, noise and distortion for the IBC application. High speed EF IBC links are tested with various modulation schemes. The minimum transmission power of different links is measured.

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Section: Introductionmentioning

confidence: 99%

High speed intra-body communication for personal health care

Zhu

Yuan

2009

2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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A low power linear output current-mediated CMOS imager

Tang

Bermak

2009

2009 1st Asia Symposium on Quality Electronic Design

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A novel CMOS current-mediated imager (CMI) is presented with high output linearity. In the proposed structure, the pixel oper ates in triode region , instead of operating in saturation region for conventional currentmediated imagers . As a consequence, the output current is a linear function of the photocurrent at the sensing node. Such a linear feature reduces the DC current consumption by more than a factor of 10 for high linearity applications. Additionally, the corresponding current source /mirror circuit is also presented, aiming to further minimize the linearity distortion caused by the Vds variation.Keywords-Current-mediated imager, low power CMOS imager.is presented in section V. II . CONVENTIONAL CURRENT-MEDIATED IMAGERSA typical 3-T CMOS current-mediated imager is demonstrated in Fig . 1. During the reset phase, M2 and M3 are enabled, and hence a known reference current I re! would flow through the diode-connected active transistor M1. Finally, the reset voltage Vres et at the sensing node Vn is defined by Eq . (1).

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Electric-Field Intrabody Communication Channel Modeling With Finite-Element Method

Zhu

Yuan

2011

IEEE Trans. Biomed. Eng.

106

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Electric-field intrabody communication (EF-IBC) is a promising new scheme for the data exchange among wearable biomedical sensors. It uses the body as the signal transmission media. Compared with existing body area network (BAN) schemes, EF-IBC can achieve higher data rate with less transmission power. Until now, the detailed EF-IBC channel mechanism is not well understood. In this work, finite-element method (FEM) is utilized for the first time to investigate the EF-IBC channel. A circuit-coupled FEM model is established for the EF-IBC channel. The FEM model is extensively verified by experimental measurements. The new physical model enables the revelation of characteristics and effects of different components in the EF-IBC channel. The FEM investigation finds that the capacitive return path is critical to the characteristics of the EF-IBC channel. Parameters of the capacitive return path are quantitatively measured. The investigation also finds that the body plays an important role to the return path capacitance. The forward body path can be well modeled by a cascade of π-shaped circuits. Based on the FEM model of the EF-IBC channel, a simplified circuit model is derived to provide an efficient tool for the transceiver design.

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Current-Mode Temporal Difference CMOS Imager for Capsule Endoscopy

Cited by 3 publications

References 7 publications

High speed intra-body communication for personal health care

High speed intra-body communication for personal health care

A low power linear output current-mediated CMOS imager

Electric-Field Intrabody Communication Channel Modeling With Finite-Element Method

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