摘要
针对将DC-50GHz取样器输出中频信号进行阶梯放大,匹配信号测试系统调节档位的需求,设计了一种基于FGPA的双通道数字程控中频放大电路。该设计由运算放大器OP37GS、模拟开关DG611EEY和高精度电阻组成。高频信号经取样器取样保持后输出频率为36.8kHz中频信号,经滤波器处理,进入数字控制中频放大电路,在FPGA的控制下,可实现0.5、1、2、2.5、5、10、20、25阶梯放大,对应于信号测试系统调节档位。通过硬件测试实验表明,设计电路可实现对中频信号的阶梯放大,线性度与精确度良好,满足应用需求。
Aiming at the requirement of stepping amplification of DC-50 GHz sampler output IF signal and matching signal test system to adjust gear position,a dual-channel digital program-controlled IF amplifier circuit based on FGPA is designed.The design consists of op amp OP37 GS,analog switch DG611 EEY and high precision resistor.The high frequency signal is sampled and held by the sampler and the output frequency is 36.8 kHz IF signal.After filtering,it enters the digital control IF amplifier circuit under the control of FPGA.It can realize 0.5,1,2,2.5,5,10,20,25 step amplification,corresponding to the signal test system to adjust the gear position.The hardware test shows that the design circuit can realize the step amplification of the intermediate frequency signal,and the linearity and accuracy are good,which meets the application requirements.
作者
杨坤
王志斌
Yang Kun;Wang Zhibin(Engineering Technology Research Center of Shanxi Province for Optic-electric Information Center,North University of China,Taiyuan 030051,China)
出处
《国外电子测量技术》
2020年第2期111-117,共7页
Foreign Electronic Measurement Technology
关键词
数字程控
中频放大
FPGA
digital program control
IF amplification
FPGA
作者简介
杨坤,硕士,主要研究方向为模拟信号放大及数据采集传输,E-mail:YK_Airplane@163.com;通信作者:王志斌,教授,主要研究方向为光电子技术与仪器,E-mail:wangzhibin@nuc.edu.cn
