A Segmented Data-Weighted-Averaging Technique

This paper proposes a new dynamic element matching (DEM) technique, segmented date weighted averaging (SeDWA), for application in a multi-bit delta-sigma modulator (DSM). In SeDWA , the DAC elements are divided into several subsets with DWA applied in each set. This allows a simpler and faster implementation, and the selecting sequences for the DAC elements are more randomized than in conventional DWA. This reduces pattern tones, but still provides mismatch error shaping. In the simulated power spectra density (PSD), no in-band pattern tones were observed, and only a moderate rise of the noise floor. Therefore, higher spurious-free dynamic range (SFDR) was achieved. The implementation of SeDWA can be simpler and faster than that of conventional DWA, making it suitable for high-speed applications