摘要
频率特性测试仪主要用来测量四端口网络的频率特性和相频特性,广泛应用于现代电子、通信等测量领域。基于Altera公司的CycloneⅢ系列EP3C16F256C8芯片,采用DDS技术产生100 k Hz^40 MHz的两路正交扫频信号,根据正交调制解调原理和现代显示技术实现对一中高频四端口网络幅频特性和相频特性曲线的测量显示。扫频间隔Δf为10 k Hz,幅频特性测量误差小于1 d B,相频特性测量精度优于3°。
Frequency characteristic tester is mainly used to measure the frequency characteristic and phase frequency characteristics of four port network,which is widely used in modern electronics,communications and other fields.A method of measuring and displaying amplitude frequency characteristic and phase frequency characteristic curve is proposed according to the orthogonal modulation and demodulation principle and modern display technology.Two channels of orthogonal swept-frequency signal is generated,of which frequency range is 100 k Hz^40 MHz by using DDS technology based on a CycloneⅢ EP3C16F256C8 chip of the Altera corporation.The swept-frequency interval of the system,Δf is 10 k Hz,which has a precision of 1 d B and phase detection accuracy of 3°.
出处
《电子器件》
CAS
北大核心
2017年第3期612-616,共5页
Chinese Journal of Electron Devices
基金
郑州市重点建设实验室项目(ZZLG201414)
关键词
FPGA
频率特性
正交调制
DDS
FPGA
Frequency characteristics
Orthogonal modulation
DDS
