一种双路正交输出的高精度低杂散直接数字合成器

A high-precision and low-spur direct digital synthesizer with dual orthogonal output

介绍了直接数字合成器(DDS)工作的原理,提出了DDS资源优化的设计方法,并在ISE(integrated software environment)软件环境下使用verilog语言在现场可编程门阵列(FPGA)上设计实现了一种双路正交输出且具有高精度低杂散的DDS.在MATLAB的环境下,对其输出的频谱特性进行了仿真,最后分析了DDS的设计参数和输出信号杂散度之间的关系,为工程应用的实现提供了设计依据.

The paper first introduces the principle and optimizing method of the direct digital synthesizer(DDS),using Verilog language inimegrated software environment(ISE)environment,a DDS with dual quadrature output and high precision and low spurious output is designed and implemented on field programmable gate array(FPGA),under the environment of MATLAB,the spectral characteristics of its output are simulated,finally analyzes the relationship of the parameters and the spurious noise,which can being a reference in DDS design.