【摘要】 上海光源增强器引出系统中有三块凸轨磁铁,需要一台带外触发的信号发生器产生励磁电流脉冲波形。该信号发生器要求三路输出独立可调,包括幅度和通断可调,还能读取各通道的当前状态,包括通断状态和幅度值。本文介绍了一种基于FPGA和DAC的脉冲信号发生器,利用FPGA可编程灵活、IO资源丰富和可配置的特点,选用了四路输出的16 bit(其中包括1 bit符号位)DAC作为模拟输出,上位机利用Matlab软件编写一个基于RS232协议的调试界面GUI。经Modelsim仿真,最后实验验证设计很好,符合预期要求。同时,作为扩展,可编写任意形状的波形数据,还可控制波形的底宽和周期。更多还原

【Abstract】 The three bump magnets in the booster extraction system of SSRF are driven by a signal generator with an external trigger.The signal generator must have three independent and controllable outputs,and both amplitude and make-and-break should be controllable,with current state information being readable.In this paper,we describe a signal generator based on FPGA and DAC boards.It makes use of characteristics of both FPGA flex programmable and rich reconfigurable IO resources.The system has a 16-bit DAC with four outputs,using Matlab to write a GUI based on RS232 protocol for control.It was simulated in Modelsim and tested on board.The results indicate that the system is well designed and all the requirements are met.The arbitrary waveform is writable,and the pulse width and period can be controlled.更多还原