关键词: 脉冲宽度调制（PWM）, 只读存储器（ROM）, 现场可编程门阵列（FPGA）, 多通道

Abstract: Aimed at the problem of the present situation of multi-channel PWM signal and difficult synchronization of the mechatronics system, it puts forward a design method of multiplex PWM generator based on ROM of the FPGA. Using ROM resources of the FPGA, it is needed that generating multiplex PWM signal through the method of using software. By using the same time base, multi-channel PWM generator can realize strict synchronization and different modulation strategy of PWM signal. The speed of FPGA data acquisition can reaches 1 MB/s, unique NiosII nuclear soft processor can realize the function of DSP, which can complete the complicated data processing. The method is actual applied in the control system of the robot arm, it preliminarily gives the hardware circuit and the simulation result with the quartus II and modelsim. The experimental results show that the design can well satisfy the system function and performance requirements, the design also is open, it can be extended.

Key words: Pulse Width Modulation（PWM）, Read-Only Memory（ROM）, Field-Programmable Gate Array（FPGA）, multiplex