Abstract：A new simplified approach to the spectrum analysis of digitally synthesized sine-waves generated by DACs is described,including amplitude and phase. The analysis is based on the perfect wave produced by the DAC according to the discrete digital values of a sinusoidal signal. The fundamental component of this wave has an approximate relative difference of -1. 644 9/n2 in amplitude and a phase shift of -p/n with respect to the ideal original sinusoidal waveform signal,where n expresses the number of samples per period. In addition,there are the harmonic components of the(tn±1)th order having an amplitude of 1/(tn±1)times the amplitude of the fundamental component(t=1,2,… ). Based on this knowledge,an experiment to compare only the fundamental component without filter is described,and some applications are discussed.
陆祖良,黄璐,杨雁,王磊,Eddy So. DAC阶梯信号频谱的新简化分析及其基波的非滤波测量[J]. 计量学报, 2011, 32(5): 392-399.
LU Zu-liang,HUANG Lu,YANG Yan,WANG Lei,Eddy So. A New Simplified Approach to Spectrum Analysis for Digital-to-Analog Converters and Its Fundamental Measurement Without a Filter. Acta Metrologica Sinica, 2011, 32(5): 392-399.
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2011, Vol. 32 
