基于 USB 接口的多通道准高斯型脉冲信号发生器设计  

Design of a USB- Based Multi- Channel Quasi- Gaussian Pulse Generator

作　　者：祁宾祥 刘树彬[1,2] 封常青[1,2] 安琪[1,2] 

机构地区：[1]核探测与核电子学国家重点实验室,中国科学技术大学,合肥230026 [2]中国科学技术大学近代物理系,合肥230026

出　　处：《核电子学与探测技术》2014年第10期1182-1186,共5页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金优秀青年科学基金(11222552)

摘　　要：设计了一种基于USB接口可编程的16通道准高斯型脉冲信号发生器。利用高速模拟开关电路产生模拟脉冲信号,DAC用于调节脉冲信号的幅度,RC网络以及运算放大器组成的成形电路决定脉冲信号的前后沿变时间,通过FPGA来编程控制模拟开关的通断和DAC的输出,利用USB接口实现PC机的通信和控制,最终输出16通道的准高斯信号。经测试,实现了预期的功能和要求,输出脉冲幅度大小可调,且各通道输出一致性很好,其积分非线性均小于0.7%,可用于大型粒子物理实验前端电子学的性能测试、校准检测等工作。The design of a USB -based 16 -channel programmable quasi -Gaussian pulse generator is de-scribed in this paper .A high-speed analog switch circuit is used to generate the analog pulse signal and digital-to-analog converter （ DAC） adjusts the amplitude of the pulse signal .A shaping circuit , composed of RC networks and operational amplifiers , decides the signal′s rise and fall time .Control of analog switch′s trigger and DAC′s output is programed by a field -programmable -gate-array （ FPGA）.Using a USB interface to communicate with the PC , the pulse generator can output 16-channel quasi -Gaussian pulse signals .Accord-ing to the test results , the pulse generator has been proven to function well .The output pulse amplitude is ad-justable.All channels have good output uniformities , and its integral nonlinearity （ INL） is less than 0.7%. The pulse generator can be used for test of large particle physics experiment ′s front-end electronics , such as calibration , scale correction and system monitor .

关 键 词：多通道 脉冲信号 校准检测 

分 类 号：TN98[电子电信—信息与通信工程]