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A Multi-bit Delta-Sigma DAC with Mismatch Shaping in the Feedback Loop
A robust new architecture for multi-bit delta-sigma data converters is presented. The second order mismatch shaping function is moved inside the feedback loop of a high order modulator, replacing the need for dynamic element matching (DEM) after the modulator. The mismatch shaper makes a trade-off between ensemble quantization error and mismatch induced error. Mismatch error in the frequencies of interest is decreased, and the resulting additional quantization error is dealt with by the delta-sigma feedback loop. This approach allows good non-tonal noise shaping performance even in the face of severe element mismatch. The modulator reliably collapses to second order to maintain stability if faced with particularly high noise energy. The modulator also has integrated SACD processing.
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