宽带Σ-Δ波形产生器中器件速率对信号频谱的影响  

Influences of Device Velocity on Signal Frequency Spectrum in Wideband Σ-Δ Waveform Generator

作　　者：朱彬[1] 陈甜[2] 施彦[2] 

机构地区：[1]成都大学现代教育技术中心,四川成都610106 [2]电子科技大学电子工程学院,四川成都610054

出　　处：《成都大学学报（自然科学版）》2009年第3期223-226,共4页Journal of Chengdu University（Natural Science Edition）

摘　　要：阐述了宽带Σ-Δ波形产生器的基本原理,并在此基础上分析了高速器件速率对实际信号波形带来的失真,以及对宽带Σ-Δ波形产生器中信号频谱的影响,建立了相应的数学模型和公式推导,进行了频谱分析和比较.仿真结果表明,高速器件速率会给信号的频谱带来一定程度的失真,使带内信号高端部分产生衰减,信噪比降低.The fundamental principle of the wideband Σ-Δ（Sigma-Delta） waveform generator was explained.Then the distortion of real signal wave resulted from high-speed device velocity and influences of device velocity on signal frequency spectrum in wideband σ-δ waveform generator were analyzed.The mathematic model and formula derivation were established followed by analysis and comparison of frequency spectrum.The simulation results show that device speed will distort the frequency spectrum in an extent,attenuate the amplitude at higher frequency part and reduce the S/N in signal bandwidth.

关 键 词：Σ-Δ 器件速率 波形产生 宽带 

分 类 号：TN957.51[电子电信—信号与信息处理]