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A cost-effective digital front-end used in 20-bit ΣΔ DAC for audio applications is described in this paper. The digital front-end is composed of an interpolator and a ΣΔ modulator (DSM). Mixed-radix number representation (MRNR) algorithm combined with poly-phase filtering technique and high efficiency hardware realization method are used to achieve high data conversion precision and reduce the area...
A stereo 20-bit sigma-delta D/A primarily intend for audio applications is described in this paper. Mixed-radix number representation algorithms and high efficiency hardware realization method are used to dramatically reduce the area of the interpolation filter. Semi-digital current-mode filter is used as the reconstruction filter to achieve high dynamic range under the low power conditions. The proposed...
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