基于FPGA+PWM的多路信号发生器设计  

An FPGA+PWM based multi-channel signal generator

作　　者：吴征[1] 苏淑靖[1] 

机构地区：[1]中北大学电子测试技术国家重点实验室,山西太原030051

出　　处：《电子技术应用》2014年第3期38-40,44,共4页Application of Electronic Technique

摘　　要：基于运放的信号发生器精度低且稳定性和可调节性差,而基于DDS的信号发生器则成本高、电路复杂。为此提出了基于FPGA+PWM的多路信号发生器设计方法。该方法硬件上无需DAC与多路模拟开关,由FPGA产生调制输出波形信号所需的PWM脉冲波,经二阶低通滤波和放大电路后即可得到所需波形信号。实验证明,该多路信号发生器幅值分辨率高,频率精度高,且具有良好的直流性能,各通道可独立产生三角波、锯齿波、正弦波、方波且输出稳定。且其成本低,设计灵活,可扩展性强,可应用于各种场合。Due to the low accuracy,bad stability and reliability of signal generator based on operational amplifier,and high cost and complex circuit of signal generator based on DDS,a design of signal generator based on FPGA＋PWM is introduced.Without DAC and multi-channel analog switch,this design uses FPGA to generate PWM pulses which can be used to get waveform signal after filtered and amplified.The experimental results show that this signal generator has high resolution of amplitude and frequency,and good DC performance,and all of its channels can be controlled independently to generate various waveform.This design is highly expansive and flexible,and its cost is low,which can be used for different occasions.

关 键 词：FPGA PWM 多路并行 高精度 信号发生器 

分 类 号：TN787[电子电信—电路与系统]