基于正交信号产生的方法比较

文中针对不同应用领域需要不同特性正交信号的问题,采用罗列比较的方法,通过具体电路的设计、制作、测试、分析、对比,得出了4种典型的正交信号产生方法及各自的优缺点。正交信号产生有4种典型的设计方案：单片机数字合成法,FPGA直接数字式频率合成器法,DDS集成芯片AD9851合成法,RC—CR相移网络法。文中介绍了这4种正交信号产生方法的具体原理并对各方法在幅值调节,频率调节范围,正交性等方面做了详细的对比,以便在不同设计要求下选择相应的设计方案。

Quadrature signal generation method based on comparison

To the problem that different applications require different characteristic orthogonal signal problem ,this article, using comparative and listed methods and passing through the specific circuit design, production, testing, analysis, comparison, obtained four typical methods that produce orthogonal signal and their respective advantages and shortcomings. Producing orthogonal signal has four kinds of typical designs： Single-chip digital synthesis, FPGA direct digital frequency synthesizer method, DDS chip AD9851 synthesis, RC-CR phase shift network method. This article introduces the specific principles of these methods and makes a detailed comparison in the amplitude adjustment, the range of adjusting frequency, orthogonality and so on to select the appropriate design fitting different designs.