【作者】 祁宾祥； 刘树彬； 封常青； 安琪；

【Author】 Binxiang Qi;Shubin Liu;Changqing Feng;Qi An;State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China;Department of Modern Physics, University of Science and Technology of China;

【机构】 核探测与核电子学国家重点实验室中国科学技术大学； 中国科学技术大学近代物理系；

【摘要】 本文设计了一种基于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来产生模拟脉冲信号,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来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,可实现预期的功能和要求,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。更多还原

【Abstract】 We designed a USB-based 16-channel programmable quasi-Gaussian pulse generator 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. According to the test results, the pulse generator has been proven to function well. The output pulse amplitude is adjustable. 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.更多还原