需打印2428 IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 40, NO. 12, DECEMBER 2005 A Low-Power Multi-Bit Modulator in 90-nm Digital CMOS Without DEM Jiang Yu, Member, IEEE, and Franco Maloberti, Fellow, IEEE Abstract―Multi-bit sigma-delta modulators are widely used in analog-to-digital conversion especially in the modern deep-submicron CMOS process. As the quantizer resolution of modulators increases, the SNR performance improves. However, the feedback DAC has to maintain high linearity. The general practice to achieve that is to use dynamic element matching (DEM). The methodology proposed in this paper will greatly reduce the complexity or even avoid usage of DEM for multi-bit modulators. The proposed methodology― truncation error shaping and cancellation―reduces the feedback DAC levels for mult……