A New DAC Mismatch Shaping Technique for Sigma-Delta Modulators

作者：Aboudina Mohamed^*; Razavi Behzad

来源：IEEE Transactions on Circuits and Systems II-Express Briefs, 2010, 57(12): 966-970.

DOI：10.1109/TCSII.2010.2083172

• Digital-to-analog converter (DAC) mismatch shaping
• high-speed analog-to-digital converter (ADC)
• sigma-delta modulators

A new Sigma Delta modulator architecture that shapes digital-to-analog converter (DAC) mismatches in a manner similar to quantization noise shaping is proposed, allowing operation with low oversampling ratios, high-resolution quantizers, and compact logic. It is shown that the proposed architecture entails a smaller feedback logic delay than data-weighted-averaging techniques, providing a fourfold delay reduction for a 6-bit feedback DAC. The front-end integrator implementation also exhibits 25% less kT/C noise than conventional architectures.

• 出版日期2010-12