YANG Le, ZHANG Ya. Design and test of capacitive micro ultrasonic transducer based on wafer to wafer bonding[J]. 2019, (2): 66-68. DOI: 10.13873/j.1000-9787(2019)02-0066-03.
基于硅硅键合的电容式微超声波换能器设计与测试
摘要
通过测试电容值的变化来分析电容式微超声波换能器(CMUT)的发射性能。介绍了CMUT的工艺过程
关键工艺为硅硅键合。利用硅硅键合工艺制作的CMUT误差小、工艺流程简单且能进行量产。利用E4990A阻抗分析仪测试CMUT电容值得到CMUT初始电容值为680 p F
阵列内电容值一致性良好
误差为0. 62 p F
并对所设计的CMUT进行带宽测试
得出其在-6 d B时归一化带宽为200%
远远优于现有的传感器。
Abstract
By testing the change of capacitance
analyze on transmitting performance of capacitive micro ultrasonic transducer(CMUT). The process is described in detail. Key process is wafer to wafer bonding. It has advantages of small error
simple process and mass production. By using the E4990 A
impedance analyzer
test capacitance of CMUT
initial capacitance 680 p F is obtained in the array