梳状滤波器在Σ-△A/D中的应用
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摘要
梳状滤波器是一种十分简单的整系数FIR数字滤波器，常用作为Σ－△A／D转换器的第一级抽取滤波器。文章分析了梳状滤波器的频率特性及其作为抽取滤波器的原理，特别指出了此种滤波器具有对Σ－△调制器成型的量化噪声的频谱形状保持不变的特性。给出了梳状滤波器的设计方法，作为一个例子对地震仪中广泛采用的Σ－△A／D转换器CS5324中的梳妆滤波器进行了分析说明。
Comb filter. a kind of very simple FIR digital filter with all coefficients being positive integer, is commonly used as the first order decimation filter is 2-d A/D converters. This paper analyzes the frequency characteristics of comb filter and the principle of using comb filter as decimation filter. It is specially pointed Out that the comb filter has the property of preserving spectral shape of noise from Σ－△A/D moodulation. The paper also gives the design method of comb filter and as an example, it analyzed the comb filter ofΣ－△A /D converter CS5324, which has been extensively used in seisrnic instruments
Comb filter. a kind of very simple FIR digital filter with all coefficients being positive integer, is commonly used as the first order decimation filter is 2-d A/D converters. This paper analyzes the frequency characteristics of comb filter and the principle of using comb filter as decimation filter. It is specially pointed Out that the comb filter has the property of preserving spectral shape of noise from Σ－△A/D moodulation. The paper also gives the design method of comb filter and as an example, it analyzed the comb filter ofΣ－△A /D converter CS5324, which has been extensively used in seisrnic instruments
引文
1 R·E·Crochiere and L·R Rabiner.Multirate digital signal processing Englewood Cliffs,NJ:Prentice-Hall. Inc.1983
2 刘益成等. Σ-△A/D转换器量化噪声分析,江汉石油学院学报,1995,(2)
3 CRYSTAL,ANALOG/DIGITAI CONVERSION IC’S, 1992. 1
2 刘益成等. Σ-△A/D转换器量化噪声分析,江汉石油学院学报,1995,(2)
3 CRYSTAL,ANALOG/DIGITAI CONVERSION IC’S, 1992. 1
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