AFM-Based Characterization Method of Capacitive MEMS Pressure Sensors for Cardiological Applications

被引:10
|
作者
Angel Miguel, Jose [1 ]
Lechuga, Yolanda [1 ]
Martinez, Mar [1 ]
机构
[1] Univ Cantabria, Grp Microelec Engn, Dept Elect Technol Syst Engn & Automat, E-39005 Santander, Spain
关键词
micro-electro-mechanical systems (MEMS) sensors; MEMS modelling; capacitive pressure sensor; MEMS characterization; atomic force microscope; stent;
D O I
10.3390/mi9070342
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Current CMOS-micro-electro-mechanical systems (MEMS) fabrication technologies permit cardiological implantable devices with sensing capabilities, such as the iStents, to be developed in such a way that MEMS sensors can be monolithically integrated together with a powering/transmitting CMOS circuitry. This system on chip fabrication allows the devices to meet the crucial requirements of accuracy, reliability, low-power, and reduced size that any life-sustaining medical application imposes. In this regard, the characterization of stand-alone prototype sensors in an efficient but affordable way to verify sensor performance and to better recognize further areas of improvement is highly advisable. This work proposes a novel characterization method based on an atomic force microscope (AFM) in contact mode that permits to calculate the maximum deflection of the flexible top plate of a capacitive MEMS pressure sensor without coating, under a concentrated load applied to its center. The experimental measurements obtained with this method have allowed to verify the bending behavior of the sensor as predicted by simulation of analytical and finite element (FE) models. This validation process has been carried out on two sensor prototypes with circular and square geometries that were designed using a computer-aided design tool specially-developed for capacitive MEMS pressure sensors.
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页数:17
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