基于MSCA的符号网络函数模拟器

Analysis on Background Spurious of DDS

提出了一种改进的用于产生模拟电路符号网络函数的符号编码算法ＭＳＣＡ。与原符号编码算法（ＳＣＡ）相比，该算法具有更简洁的编码单元，更为准确的编码定理，从而能明显地提高算法的效率和应用范围。基于ＭＳＣＡ用于模拟电路的符号网络函数模拟器ＳＮＳＡＣ已经开发完成，还介绍了ＳＮＳＡＣ的基本结构和特点。最后给出了程序应用的两个例子。

Based on the signal analysis methods and the equivalent to the phase accumulator,the distribution rules of direct digital synthesizer(DDS) with amplitude quantization (ROM truncation) are deduced.The results are agreed with the computer simulation given by the Ref ,and the DDS theory is completed.