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A Low-Power Digital IC Design Inside the Wireless Endoscopic Capsule

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5 Author(s)
Xiang Xie ; Dept. of Electron. Eng., Tsinghua Univ., Beijing ; Guolin Li ; Xinkai Chen ; XiaoWen Li
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This paper proposes an architecture of the wireless endoscopy system for the diagnoses of whole human digestive tract and real-time endoscopic image monitoring. The low-power digital IC design inside the wireless endoscopic capsule is discussed in detail. A very large scale integration (VLSI) architecture of three-stage clock management is applied, which can save 46% power inside the capsule compared with the design without such a low-power design. A stoppable ring crystal oscillator with minimal overhead is used in the sleep mode, which results in about 60-muW system power dissipation in sleep mode. A new image compression algorithm based on Bayer image format and its corresponding VLSI architecture are both proposed for low-power, high-data volume. Thus, 8 frames per second with 320*288 pixels can be transmitted with 2 Mb/s. The digital IC design also assures that the capsule has many flexible and useful functions for clinical application. The digital circuits were verified on field-programmable gate arrays and have been implemented in 0.18-mum CMOS process with 6.2 mW

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Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 11 )