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《Journal of Tianjin University》 2007-12
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Multistage Realization of Decimation Filter in ∑-Δ ADC

MA Shao-yu,HAN Yan,CAI You (Institute of Microelectronics and Optoelectronics,Zhejiang University,Hangzhou 310027,China)  
A multistage decimation filter for audio oversampling∑-Δ A/D converter was designed and implemented in SMIC 0.18 μm CMOS process.The filter consists of a cascaded-integrator-comb(CIC) filter,a compensation filter and two FIR half-band filters.The compensation filter offsets the droop of the CIC filter,the pass-band ripple of the decimation filter was less than 0.006 dB after compensation.A twice decimation was also achieved by the compensation filter,which resulted in hardware saving of a half-band filter.Canonic signed digit(CSD) number system with shifters and adders was used instead of large multipliers.By processing the bit stream from a 3-level ∑-Δ modulator with an oversampling ratio of 256,a signal-to-noise ratio of 107 dB was obtained for the filter,which was sufficient for the high-end audio applications.
【CateGory Index】: TN713.7
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