2013年全国大学生电子设计竞赛简易频率特性测试仪E题优秀论文.pdf
文本预览下载声明
2013年全国大学生电子设计竞赛
简易频率特性测试仪 (E 题)
【本科组】
2013 年 9 月 7 日
1
摘 要
摘要:本系统是基于 FPGA 和 STM32作为主系统,由控制两片高速DAC900,产生两路相正
交的扫频信号(1MHZ—40MHZ),而 STM32作为整个系统的主控系统。通过 STM32控制扫频信号
输出实现闭环稳幅,再通过乘法器 AD835实现扫频信号与被测网络出来信号的混 (倍频),
再通过 RC 低通滤波,用 STM32内部AD 采集测出并显示幅频特性与相频特性,显示在彩屏中,
是一款很不错的简易频率特性测试仪。很好的实现了题目的要求以及大部分的发挥部分。
关键字:扫频信号 FPGA STM32 混频 乘法器
【Abstract 】 The system is based on FPGA and STM32 as the main system,
controlled by the two high-speed DAC900, generates two orthogonal sweep signal
(1MHZ-40MHZ), while the STM32 master control system as a whole system. STM32 sweep
signal output via closed-loop control leveled, and then through the multiplier AD835
achieve sweep signal and the measured network out mixed signals (frequency), and
then through an RC low-pass filter, with the STM32 internal AD collection and
displays the measured amplitude-frequency characteristic and phase-frequency
characteristics, shown in color, the simplicity is a very good frequency
characteristics tester. Achieved a very good and most of the requirements of the
subject play a part.
Key Word: Frequency sweep signal FPGA STM32 mixing multiplier
显示全部