High dynamic range design for Sigma Delta M with wide input ranges
A new design algorithm is introduced to improve the input ranges of Sigma-Delta Modulation (Sigma Delta M). Modified digital error correction techniques are proposed and employed to carry out the wide range DAC of a Sigma Delta modulator. This design algorithm includes the advantages from both single-bit Sigma Delta M and multi-bit Sigma Delta M. This paper utilizes a second order lowpass Sigma Delta modulator as an explanatory example to demonstrate our design process as well as the performance improvement. The analytical results from a quasilinear model are described to offer a theoretical explanation of the system performance. This algorithm can also be applied to bandpass and MASH architectures.
dynamic range sigma delta sigma-delta dac adc multi-bit sigma delta adc oversampling rate quantization noise decimation filter digital error self-calibration sndr