摘要
针对电磁超声换能器接收线圈接收到的信号通常十分微弱的特点,设计了分别应用NJM4580和AD620的微小信号放大电路,并通过美国国家仪器公司的Multisim 10软件中波特图仪和示波器对两前置放大电路进行虚拟仿真,并对仿真结果进行比较,验证了应用AD620的放大电路在微小信号放大上不仅电路构成简单,而且在放大性能上更加优于应用NJM4580运算放大器构成的差分级联放大电路。
Because the signal received by electromagnetic acoustic transducer（EMAT） is very weak,two weak signal amplifying circuits which respectively adopted NJM4580 and AD620 were designed.The virtual simulation for the two pre-amplification circuits were conducted by Bode plotter and oscilloscope in Multisim10 produced by NI and the simulated results of the two circuits were compared.The results show that the circuit with AD620 is better than the one with NJM4580.The structure of the former one is more simple and the amplification capability is more superior.
出处
《现代电子技术》
2011年第20期156-158,共3页
Modern Electronics Technique
基金
国家自然科学基金资助项目(61072035)
辽宁省博士启动基金资助项目(20081075)
教育部留学归国基金项目
大连市人才基金项目(2009J21DW006)
