摘要
分析了“较高频DDS输出”时DAC非理想特性,特别是转换阶段和闪变阶段,建立了波形模型,求得相应的Fourier变换,从而得到新的频谱解析式。试验采用AD I公司的DDS芯片AD9851,测量了信号幅频特性,证明了较以往解析式,新解析式和实测更加接近。
Non-ideal characteristics of DAC are analyzed in this paper when ＂higher frequency DDS signal＂ is on,especially the performance in DAC＇s Slew stage and Glitch stage.Then a waveform model is constructed and its Fourier transform is attained.At last,a novel analytical expression of ＂higher frequency DDS signal＂ is obtained.In this experiment based on DDS IC AD9851 produced by ADI Inc.,the amplitude spectrum of DDS signal is measured,demonstrating that compared with former expression,the new one fits measurement better.
出处
《中国电子科学研究院学报》
2007年第2期136-138,143,共4页
Journal of China Academy of Electronics and Information Technology
关键词
DDS
频谱
解析式
数模转换器
非理想特性
DDS
frequency spectrum
analytical expression
DAC
non-ideal characteristics
