宽带等精度数字测频系统设计  

Design of Equal Precision Digital Cymometer

作　　者：徐德仁[1] 黄明[1] 王灿[1] 吉祥[1] 

机构地区：[1]北方工业大学电子信息工程学院,北京100144

出　　处：《电子科学技术》2016年第6期685-688,共4页Electronic Science & Technology

基　　金：北方工业大学学生科技活动项目;北京市大学生科学研究与创业行动计划项目的资助与支持

摘　　要：本文应用等精度测量法,提出了一种宽带小信号数字频率计的设计方案,满足10KHz^100MHz带宽内万分之一的频率测量精度。模拟信号通过OPA691放大器宽带放大、TLV3501高速整形,进入FPGA进行等精度数字频率测量,测量结果通过总线传送给STM32系统显示,系统在带宽范围内均达到了测量精度要求。测频核心程序用Verilog语言编写,并给出了模块设计及测量结果。整个系统具有成本低廉、简单实用、测量精度高的优点。This paper proposes a design of digital cymometer based on the equal precision measurement for broadband small signal, which meet frequency measurement precision with 0.01% from 10 KHz to 100 MHz bandwidth. Analog small signal is amplified and sharped when it pass through the OPA691 Op-amp Chip and TLV3501 high-speed comparator, then go into the FPGA for frequency measurement, and the result shows in the STM32 system. All frequency measurement come true through Verilog programming. This paper also offers various modules of the simulation diagram and the measurement results which achieve the precision＇s requirement in the bandwidth range. The whole system is inexpensive, simple and practical with high precision.

关 键 词：数字频率计 等精度测量法 OPA691 宽带放大 

分 类 号：TM935.1[电气工程—电力电子与电力传动]