一种宽带全量程示波器信道保护器研制  

Development of a wide-bandwidth full-range oscilloscope channel protector

作　　者：李海涛[1] 李斌康[1,2] 陈彦丽 田耕[1,2] 赵前[1] 阮林波 Li Haitao;Li Binkang;Chen Yanli;Tian Geng;Zhao Qian;Ruan Linbo(Northwest Institute of Nuclear Technology,Xi′an 710024,China;State Key Laboratory of Simulation and Effect for Intense Pulse Radiation,Xi′an 710024,China)

机构地区：[1]西北核技术研究所,陕西西安710024 [2]强脉冲辐射环境模拟与效应国家重点实验室,陕西西安710024

出　　处：《电子技术应用》2021年第7期106-110,共5页Application of Electronic Technique

摘　　要：基于THS3491运算放大器芯片研制示波器信道保护器,应用在脉冲辐射场诊断测试之中。研究测试了SOIC、VQFN两种封装的THS3491的幅频特性曲线,采用VQFN封装的THS3491作为保护器的核心芯片;研制的保护器输出电压幅值范围为±10 V(50Ω负载),等效电噪声峰峰值约为2 mV;-3 dB小信号带宽约为850 MHz,0.3 dB平坦度带宽约为710 MHz,发现并理论解释了保护器输出电压的峰移现象。通过delta脉冲信号源对保护器进行测试,对比输入输出电压波形,实现了无失真的delta响应;在输出信号电压幅值范围超过±10 V时,保护器进入到输出保护状态,输出恢复时间小于7 ns,可以很好满足脉冲辐射场诊断中的示波器信道保护要求。An oscilloscope channel protector is developed based on the THS3491 operational amplifier,which is used in the diagnosis of pulse radiation field.By comparing and analyzing the bode plots of THS3491 in SOIC and VQFN packages,the THS3491 in VQFN package is used as the core chip of the protector.The output voltage range of the developed protector is±10 V(50Ωload),the peak-to-peak voltage noise is about 2 mV;the-3 dB small signal bandwidth is about 850 MHz,and the 0.3 dB flatness bandwidth is about 710 MHz.The paper discovered and theoretically explained the peak shift phenomenon of the protector output voltage.The protector was tested by a delta signal source to achieve a distortion-free delta response.When the output voltage amplitude range exceeds±10 V,the protector enters the output protection state,and the recovery time is less than 7 ns,which can well meet the oscilloscope channel protection requirements in the pulse radiation field diagnosis.

关 键 词：信道保护 小信号带宽 带内平坦度 输出摆率 恢复时间 

分 类 号：TN79[电子电信—电路与系统]