›› 2014, Vol. 27 ›› Issue (8): 57-.

• 论文 • 上一篇    下一篇

基于DDS构建可调频稳幅信号发生器

周璟瑜,林凡强,徐磊   

  1. (成都理工大学 信息科学与技术学院,四川 成都 610059)
  • 出版日期:2014-08-15 发布日期:2014-07-21
  • 作者简介:周璟瑜(1993—),女,本科。研究方向:电子信息工程。E-mail:jingkaren3300@gmail.com。林凡强(1977—),男,博士研究生。研究方向:电子信息工程。

Variable-frequency and Stable Amplitude Signal Source Based on DDS

ZHOU Jingyu,LIN Fanqiang,XU Lei   

  1. (College of Information Science and Technology,Chengdu University of Technology,Chengdu 610059,China)
  • Online:2014-08-15 Published:2014-07-21

摘要:

系统采用基于DDS工作原理的AD9851,以单片机为控制核心,设计了可产生频率可调的稳幅高精度正弦波、方波信号发生器。输出级通过椭圆滤波器去除高频噪声以稳定信号,并采用乙类推免功率放大器电路以提高系统的负载能力。阐述了芯片与外部电路接口的硬件结构并作出详细的系统测试。该设计在50 Ω负载下,输出峰-峰值0~20 V连续可调,整个系统电路简单、功能强大、可扩展性强。

关键词: DDS, 椭圆滤波器, 乙类推免功率放大器

Abstract:

A signal source capable of adjustable sinusoidal and square waves with stable range and reliable precision is designed based on the DDS with a single-chip as the control.The elliptic filter is used to remove the high frequency noise and stabilize the signal at the output,and the B-free power amplifier circuit to improve system load capacity.The hardware circuits are described and tested.The peak-to-peak value is continuously adjustable 0~20 V on a load of 50 Ω.The system has the advantages of simple circuit,powerful functions and good expandability.

Key words: DDS;elliptic filter;B-free power amplifier circuit

中图分类号: 

  • TN741