| 陈谋,何常德,孟亚楠,张斌珍,任勇峰,张文栋.面向电容式微机械超声换能器器件的32通道收发 电路设计与测试*[J].,2022,41(3):436-446 |
| 面向电容式微机械超声换能器器件的32通道收发 电路设计与测试* |
| Design and test of 32-channel transceiver circuit for capacitive micromachined ultrasonic transducer device |
| 投稿时间：2021-01-26 修订日期：2022-05-01 |
| 中文摘要: |
| 针对以电容式微机械超声换能器（CMUT）阵列为探头的超声成像系统，设计了一种兼具FPGA控制、脉冲驱动以及微弱电流信号检测功能的电路。利用FPGA产生64路控制信号，控制脉冲信号的频率、脉冲个数、占空比等参数；脉冲电路在FPGA以及直流电压的控制下，产生32路脉冲信号；接收电路通过跨阻放大结构实现32路电流信号检测；32通道收发电路利用脉冲产生芯片内自带的T/R开关进行高压隔离。通过搭建测试平台，对收发电路功能及一致性进行测试，并连接CMUT进行自发自收测试。测试结果表明，32通道收发电路具有良好的一致性，电路可以实现基于CMUT阵列的32通道超声信号的发射，并检测回波信号。电路具有功能完善，结构稳定的优点，为基于CMUT阵列的超声成像系统的应用提供了硬件支持。 |
| 英文摘要: |
| Aiming at the ultrasonic imaging system with CMUT array as probe, a circuit with FPGA control, high-voltage drive and current signal detection function is designed. FPGA is used to generate 64 channel control signals to control the frequency, pulse number , duty cycle and other parameters of the pulse signal. The pulse circuit generates 32 channel pulse signals under the control of FPGA and DC voltage. The 32 channel transceiver circuits uses the T/R switch in the pulse generator chip for high-voltage isolation. The 32-channel current signal are detected by TIA. By building a test platform, the function and consistency of the transceiver circuit are tested, and the CMUT is connected to test its own transmitter and receiver. The test results show that the 32 channel transceiver circuit has good consistency. The circuit can transmit 32 channel ultrasonic signal based on CMUT array and detect the echo signal. The circuit has the advantages of perfect function and stable structure, which provides hardware support for the application of ultrasonic imaging system based on CMUT array. |
| DOI：10.11684/j.issn.1000-310X.2022.03.014 |
| 中文关键词: CMUT FPGA控制 脉冲驱动 电流信号检测 收发 |
| 英文关键词: CMUT FPGA control pulse drive current signal detection receiving and transmitting |
| 基金项目:国家重点研发计划:掌上彩色超声成像系统研发(2016YFC0105000);国家重点研发计划:基于MEMS技术的阵列式微型声压传感器研制(2018YFF01010500);国家重大科研仪器研制项目:基于高密度CMUT柱面阵的乳腺三维超声CT成像系统研究（61927807）;国家电网公司科技项目资助(SGSXSZOOFCWT2000147);山西省“1331工程”重点学科建设计划。 |
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