数字式频率响应分析仪的研制

Development of Digital Frequency Response Analyzer

针对市面上的频率响应分析仪比较昂贵以及在教学实验时使用不方便的情况,研制了一种低成本的数字式频率响应分析仪.所研制的频率响应分析仪采用数字信号处理器(DSP)作为系统主控芯片、直接数字频率合成器(DDS)作为信号源、触摸式串口屏作为人机接口设备.该分析仪可通过触摸式串口屏设置测试环境参数、显示测试数据及特性曲线.样机测试结果表明该分析仪精度满足要求、操作方便、制作成本较低.

A low-cost digital frequency response analyzer is developed to solve the problem that the price of fre-quency response analyzer on the market is relatively expensive and it is inconvenient to use in teaching experi-ments.The developed frequency response analyzer uses digital signal processor(DSP)as the main control chip of the system,direct digital frequency synthesizer(DDS)as the signal source,and touch serial port screen as the man-machine interface device.The analyzer can set the parameters of test environment,display the test da-ta and the characteristic curve through the touch serial port screen.The test results of the prototype show that the accuracy of the analyzer meets the requirements,the operation is convenient and the manufacturing cost is low.