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A Cascaded Delta-Sigma DAC with DWA for Decreasing Mismatch Effect

In this paper, we propose a small-sized and high performance cascaded delta-sigma DAC (CDS-DAC) that uses an analog FIR filter including a second mismatch shaping functions. If multi-bit DAC was composed, the mismatch caused by variation of elements degrades the overall performance in analog part. We propose novel CDS-DAC having a second-order mismatch shaping function, which can be realized with several switches in analog part and a first order mismatch shaper in digital part in order to improve a performance degradation caused by the mismaches. The simulation result is obtained the SNR of the proposed CDS-DAC is 122 dB when the oversampling ratio is 128 and mismatch of components is 1%.

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