基于泰勒级数线性插值的DDFS研究

直接数字频率合成器是信号源的核心,也是目前的一个研究热点。本文介绍了直接数字频率合成器(direct digital frequency synthesizer,DDFS)的工作原理;详细介绍了基于泰勒级数的线性插值法减少ROM使用量的原理,研究了基于该方法的直接数字频率合成器的实现电路。对电路原理进行了分析并进行了仿真,仿真结果验证了基于泰勒级数的线性插值法可有效的减少ROM的使用量。最后分析并讨论了电路各参数对DDFS频谱纯度的影响。

Study of DDFS based on Taylor-series-based linear interpolation

Direct digital frequency synthesizer is the core of signal source,is also currently a hotspot. This paper introduces the principle of DDFS,described in detail based on the Taylor series of linear interpolation ROM reduce the use of the principle, then studied on the realization of circuits based on the method of DDFS. At last the architecture is simulated, experimental results verify that this method can minimize ROM efficiently, at last analyzing the effect of varying parameters on spectral purity of the sine.