带通Sigma-Delta调制器的模拟延时器Simulink建模  

Simulink model of analog delay for bandpass Sigma-Delta modulators behavioral simulation

作　　者：吕凤铭 李荣宽[1] 张梦月 何国军[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都610054

出　　处：《电子技术应用》2014年第6期45-48,共4页Application of Electronic Technique

摘　　要：带通Sigma-Delta调制器常用的行为级仿真工具是基于Simulink仿真环境的SD Toolbox工具箱,但是该工具箱中只有两个延时单元的谐振器模型,无法对一个延时单元或无延时单元的谐振器进行模拟。针对模拟开关电容单位延时器的非理想因素,尤其是有限直流增益,进行了详细的分析,并据此利用Matlab对其进行了行为级建模。利用构建的模拟单位延时器模型可以很好地弥补SD Toolbox工具箱的上述不足。仿真结果表明,所构建的模型与电路实现的结果较为接近。The SD Toolbox is the common behavioral simulation tool of bandpass Sigma-Delta modulator, which is based on the Simulink environment. But there is only a resonator model with two delay units in the toolbox, which means that the toolbox could not be used to simulate the resonators with one delay unit or no delay unit. This paper analyses most of the non-ideal fac- tors of SC analog delay, especially the limited DC gain, and accordingly carries out the factors＇ behavioral models with Matlab. The constructed models could compensate for the mentioned shortcoming of SD Toolbox. The results of the bandpass Sigma-Delta modu- lator behavioral simulation show that the designed model is closed with the actual SC circuits.

关 键 词：模拟延时器 带通Sigma-Delta调制器 行为建模 仿真 开关电容电路 

分 类 号：TN402[电子电信—微电子学与固体电子学]