基于FPGA的宽带信号产生和频率测量电路  

Wideband signal generation and frequency measurement circuits based on FPGA

作　　者：王丽娜[1,2] 杨绪森 许冉 徐伟[1,2] 吴静 石晨鸣 WANG Lina;YANG Xusen;XU Ran;XU Wei;WU Jing;SHI Chenming(Jiangsu Key Laboratory of Meteorological Observation and Information Processing,Nanjing University of Information Science and Technology,Nanjing 210044,China;College of Electronics and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学江苏省气象探测与信息处理重点实验室,江苏南京210044 [2]南京信息工程大学电子与信息工程学院,江苏南京210044

出　　处：《现代电子技术》2018年第17期107-111,共5页Modern Electronics Technique

基　　金：国家自然科学基金项目(41605121);江苏高校品牌专业建设工程资助项目;江苏高校"信息与通信工程"优势学科Ⅱ期建设工程资助项目~~

摘　　要：设计基于FPGA的高频信号产生和频率测量电路。系统以FPGA为核心,辅以高速D/A、无源滤波、自动增益控制AGC等模块构成。利用FPGA对标准信号波形进行存储,结合DDS技术,通过高速D/A和无源滤波实现信号的产生。FPGA的计数器、闸门等实体电路实现了等精度测频。利用NIOS实现人机交互功能。实验测试表明,系统输出的三角波、正弦波、方波具有频带宽、频率稳定的特点,测频的相对误差达到10-6。The high-frequency signal generation and frequency measurement circuits based on FPGA are designed.The system takes FPGA as its core,and is composed of high-speed D/A,passive filter,automatic gain control(AGC)module,etc.FPGA is used to store the standard signal waveform,and combined with DDS technology to realize the signal generation by means of high-speed D/A and passive filter.The counter,strobe and physical circuits of FPGA are used to realize the equal precision frequency measurement.The NIOS is used to realize the human-computer interaction function.The experimental results show that the triangular wave,sine wave and square wave output by the system have the characteristics of wide frequency band and stable frequency,and the relative errors of frequency measurement can reach up to 10-6.

关 键 词：FPGA 模拟电路 等精度测频 波形产生 DDS原理 NIOS 

分 类 号：TN710.4-34[电子电信—电路与系统] TP274[自动化与计算机技术—检测技术与自动化装置]