电子器件Issue(4)：868-875,8.DOI:10.3969/j.issn.1005-9490.2015.04.031
一种简易数字控制频率特性测试仪的设计
The Design of a Simple Digital Control Frequency Characteristic Test Instrument for Digital Control
陈松 1荣军1
作者信息
- 1. 湖南理工学院信息与通信工程学院，湖南 岳阳414006
- 折叠
摘要
Abstract
A simple frequency characteristic test instrument system is designed with STM32F407 as control core,and the system can measure the amplitude frequency characteristics and phase frequency characteristics of two-port net-work ranging from 1 MHz to 40 MHz. The system uses analog multiplier AD835 and second-order active low-pass filter to get the orthogonal demodulation circuit,and then finishes analogy signal to digital signal conversion by high resolution ADC chip ADS1271. Finally,the amplitude frequency characteristics and phase frequency characteristics of the tested network will be displayed by a displaying module. The system has been tested,and the system can tell the amplitude-versus-frequency curve of the measured network correctly as well as its center frequency and band-width of 3 dB,and the accuracy of voltage gain is better than 0.5 dB,phase of that better than 5 degree.关键词
频率特性测试/数字控制/零中频正交解调/品质因数Key words
frequency characteristic test/digital control/zero intermediate frequency orthogonal demodulation/quality factor分类
信息技术与安全科学引用本文复制引用
陈松,荣军..一种简易数字控制频率特性测试仪的设计[J].电子器件,2015,(4):868-875,8.
