一种基于Butterworth滤波器的DAC幅频特性模型  

A model of D/A converter amplitude frequency response characteristic based on Butterworth filter

作　　者：李志坚[1,2] 曾大治[2] 龙腾[2] 

机构地区：[1]华南理工大学电子与信息学院,广东广州510640 [2]北京理工大学信息科学技术学院电子工程系,北京100081

出　　处：《电路与系统学报》2010年第4期101-103,69,共4页Journal of Circuits and Systems

基　　金：华南理工大学自然科学青年基金项目(x2dxD2103700)

摘　　要：首先分析了理想DAC幅频响应特性,然后采用沿函数和矩形脉冲函数卷积和的方式对DAC单位冲激响应建模。最后采用Butterworth滤波器的方式,建立了DAC幅频响应模型,并根据实际电路提取模型参数。仿真表明模型能够准确反映电路特性,克服了分数阶保持模型的偶数倍奈奎斯特频带内的谱峰分裂现象。试验证明这种模型与实测数据吻合。The amplitude frequency response characteristic of an ideal Digital-to-Analog Converter is analyzed firstly.Then the unit-impulse-response of DACs is modeled in approach of convoluting a so-called Edge-Function with an ideal rectangle pulse function.Finally,the amplitude frequency response characteristic model of a DAC is created based on Butterworth filter,and the parameters is extracted from the practical circuits.Simulations indicate that the model can mirror the circuits characteristic factually,and it gets over the spectrum peak split phenomena in even multiple of Nyquist-frequency-band when using Fractional-Order-Hold model.The experiment shows that the new model fits measurement better.

关 键 词：数模转换器 幅频响应 BUTTERWORTH滤波器 

分 类 号：TN911.71[电子电信—通信与信息系统]