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Acoustic radiation-free surface phononic crystal resonator for in-liquid low-noise gravimetric detection

Microsystems & Nanoengineering 2021年第1期7卷 99-108页

作者： Feng Gao amine bermak Sarah Benchabane Laurent Robert Abdelkrim Khelif College of Science and Engineering Hamad Bin Khalifa UniversityEducation CityDohaQatar Institut FEMTO-ST CNRSUniversitéde Bourgogne-Franche-ComteBesanconFrance

Acoustic wave resonators are promising candidates for gravimetric ***,they generally suffer from strong acoustic radiation in liquid,which limits their quality factor and increases their frequency *** article presents an acoustic radiation-free gravimetric biosensor based on a locally resonant surface phononic crystal(SPC)consisting of periodic high aspect ratio electrodes to address the above *** acoustic wave generated in the SPC is slower than the sound wave in water,hence it prevents acoustic propagation in the fluid and results in energy confinement near the electrode *** energy confinement results in a significant quality factor improvement and reduces frequency *** proposed SPC resonator is numerically studied by finite element analysis and experimentally implemented by an electroplating-based fabrication *** results show that the SPC resonator exhibits an in-liquid quality factor 15 times higher than a conventional Rayleigh wave resonator at a similar operating *** proposed radiation suppression method using SPC can also be applied in other types of acoustic wave ***,this method can serve as a general technique for boosting the in-liquid quality factor and sensing performance of many acoustic biosensors.

关键词： resonator Acoustic liquid

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Smart Image Sensor with Integrated Low Complexity Image Processing for Wireless Endoscope Capsules

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Tsinghua Science and Technology 2009年第5期14卷 586-592页

作者：李晓雯张沕琳王志华 amine bermak Department of Electronic Engineering Tsinghua University Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Institute of Microelectronics Tsinghua University

A smart image sensor was developed which integrates a digital pixel image sensor array with an image processor, designed for wireless endoscope capsules. The camera-on-a-chip architecture and its on-chip functionality facilitate the design of the packaging and power consumption of the integrated capsule. The power reduction techniques were carried out at both the architectural and circuit level. Gray coding and power gating in the sensor array to eliminate almost 50% of the switch activity on the data bus and more than 99% of the power dissipation in each pixel at a transmitting rate of 2 frames per second. Filtering and compression in the processor reduces the data transmission by more than 2/3. A parallel fully pipelined architecture with a dedicated clock management scheme was implemented in the JPEG-LS engine to reduce the power consumption by 15.7%. The smart sensor has been implemented in 0.18 μm CMOS technology.

关键词： wireless endoscope capsule digital pixel sensor JPEG-LS low power

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