基于USB2．0的信号发生器的设计与实现

针对传统信号发生器存在的诸多弊端,提出了一种基于USB2.0协议下的简易信号发生器的构造和实现方法。基于Cypress半导体公司的EZ-USB FX2芯片给出了其硬件组成、驱动程序框架和主要的固件程序代码。该方法采用直接数字合成方法,结合现场可编程技术,通过软件和硬件性能的结合完成了双通道信号的频率、幅度、相位的高精度调整。将参数调整,波形数据细分的复杂计算任务交于主机程序完成,简化了外设执行部件的电路结构。该信号发生器结构简单,信号失真小,配置灵活,可达到所见即所得的效果。

Implementation of Simple Signal Generator Based on USB2.0

Considering the disadvantages of the traditional signal generator,a method is summarized for constructing and realizing simple signal generator based on USB2.0.Using the Cypress EZ-USB FX2 chip,a scheme for the hardware design is provided,a driver framework and the main firmware are given too.Under combining the direct data synthesis technology and the In System Programmability,it provides good performance between the software and the hardware.It also makes the high precision adjusting to the corresponding frequency,volume and phase for two channel signals.The host program takes on the complex computational tasks such as parameter adjusting and the waveform data subdividing,which simplifies the circuit for the peripheral unit.This signal generator has simple construction,minimum distortion,flexible configuration,and can approach that what you see is what you want.