低噪声键控宽频信号源设计与实现  

Design and realization of low noise keying broadband signal source

作　　者：董轲强 杨其华[1] 张珂[1] 

机构地区：[1]中国计量学院质量与安全工程学院,杭州310018

出　　处：《电测与仪表》2016年第8期119-123,共5页Electrical Measurement & Instrumentation

摘　　要：设计了一种以直接数字频率合成(DDS)芯片AD9953为核心的键控宽频信号源,可输出0~150 MHz正弦波交流信号,幅值范围50 m V^50 V可调,谐波失真小于3%。介绍了键控宽频信号源系统的结构组成,低通滤波器和阻抗匹配设计。信号源经实际测试,输出频率,输出幅值,谐波大小等各项技术指标均达到要求。A kind of keying broadband signal source based on the direct digital frequency synthesis（ DDS） chip is designed in this paper. It can output sine a. c. signal from 0 to 150 MHz,the amplitude adjustable range is from 50 m V to 50 V,and the harmonic distortion is less than 3%. This paper introduces the architecture of the keying broadband signal source system,and the design of low pass filter and impedance matching. Various technical indexes,such as output frequency,output amplitude,harmonic,are achieved by actual test.

关 键 词：宽频信号源 信号处理 低通滤波器 阻抗匹配 

分 类 号：TM93[电气工程—电力电子与电力传动]