Digital noise-shaping filter with real coefficients and method for making the same

The disclosures in Korean Application No. 2000/34951, filed Jun. 23, 2000, and International Application No. PCT/KR01/01069, filed Jun. 22, 2001, are hereby incorporated by reference. A digital noise-shaping filter with real coefficients for delta-sigma data converters used in a digital amplifier, 1...

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Main Authors Lee, Ducksoo, Choi, Yeongha, Doo, Sejin, Park, Kyoungsoo, Sung, Koeng-Mo
Format Patent
LanguageEnglish
Published 02.12.2003
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Summary:The disclosures in Korean Application No. 2000/34951, filed Jun. 23, 2000, and International Application No. PCT/KR01/01069, filed Jun. 22, 2001, are hereby incorporated by reference. A digital noise-shaping filter with real coefficients for delta-sigma data converters used in a digital amplifier, 1-bit digital/analog converter, 1-bit analog/digital converter and the like, and a method for making the same. The present digital noise-shaping filter has improved noise suppression performance and system stability and reduced calculation complexity. To this end, the digital noise-shaping filter comprises a noise transfer function expressed by NTF(z)=−1+az+az+ +az. The noise transfer function has optimum real coefficients or real coefficients approximating them.