Computer Aided Design of Front End Electrical Matching Circuit for Ultrasonic Transducer

• Main Authors: Jian,Jia -Jun, 簡嘉俊
• Other Authors: Tsao,Jen-Ho
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/12459387689946049839

碩士 === 國立臺灣大學 === 電信工程學研究所 === 89 === There is much improvement for digital ultrasonic image system function, and its applications are widely used. The quality of the signal is limited to transducer and front-end analog circuit. The circuit impedance mismatch makes the signal output, efficiency and sensitivity of the transducer lower. This study will use precise circuit model of the transducer and the computer-aided design of the front-end circuit to understand the circuit impedance mismatch and improve the effective bandwidth and signal-to-noise ratio of front-end system. Before the production of the transducers, the efficiency of the front-end circuit may be predicted by the precise equivalent circuit model of the transducer. By searching the parameters, the computers could find out the best-matched circuit parameters. Through the results of the simulation, adding suitable matched circuit may improve the signal-to-noise ratio and effective bandwidth of the front-end circuit, and it may obtain larger effective bandwidth in loss of part of signal-to-noise ratio.