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DDFS spurious signals due to amplitude quantization in absence of phase-accumulator truncation
Authors:Tian Xinguang  Liu Xin  Chen Hong  Duan Miyi
Affiliation:1. Inst. of Computing Technology, Heijing Jiaotong Univ., Beijing 100029, P. R. China;Inst. of Computing Technology, Chinese Academy of Sciences, Beijing 100080, P. R. China
2. Inst. of Computing Technology, Heijing Jiaotong Univ., Beijing 100029, P. R. China
Abstract:Spurious signals in direct digital frequency synthesizers (DDFSs) are partly caused by amplitude quantization and phase truncation, which affect their application to many wireless telecommunication systems. Thee signals are deterministic and periodic in the time domain, so they appear as line spectra in the frequency domain. Two types of spurious signals due to amplitude quantization are exactly formulated and compared in thetime and frequency domains respectively. Then the frequency spectra and power levels of the spurious signals due to amplitude quantization in the absence of phase-accumulator truncation are emphatically analyzed, and the effects of the DDFS parameter variations on the spurious signals are thoroughly studied by computer simulation. And several important conclusions are derived which can provide theoretical support for parameter choice and spurious performance evaluation in the application of DDFSs.
Keywords:spurious signal  direct digital frequency synthesizer  amplitude quantization  phase truncation  powerlevel
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