复旦大学电子工程系
纸质出版:1995
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[1]洪志良.用于18位Σ△A/D变换器的降频和低通滤波器[J].电子学报,1995(08):80-82.
Hong Zhiliang. Decimator and Lowpass Filter in 18 Bit Σ△A/D Converter[J]. Acta Electronica Sinica, 1995, (8).
本文介绍用于18位Σ△A/D变换器的降频和低通电路。降频部分由5阶IIR滤波器,32:1降频器和5阶FIR滤波器组成,低通采用二级波数字滤波器,在降频和波数字滤波器中加入补偿电路,用于补偿降频器的损失。
This paper presents the decimator and lowpass filter in 18 bit Σ△A/D with an oversamplng ratio of 128.The decirnator consists of 5th order IIR and FIR with decimation of 32 between IIR and FIR
and the lowpass filter has two wave digital filters.To compensate the degradation of decimator in passband
a sinc corrector is applied after the decimator.
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