Title :
A low over-sampling ratio delta-sigma modulator for standard and wideband applications
Author :
Du, Y.Y. ; Tiew, K.T.
Author_Institution :
Center for Integrated Circuits & Syst., Nanyang Technol. Univ., Singapore
Abstract :
A 6th-order three-stage MASH (multi-stage noise shaping) wideband delta-sigma modulator (WDSM) is proposed for operation at low oversampling ratio of 4, 6, 8, 12 and 16. The proposed architecture features optimum noise transfer function, optimum parameter choices as well as multi-bit quantizers to achieve high dynamic range performance at oversampling ratio as low as 4. By varying some parameters in tandem with different oversampling ratio, this modulator is also suitable for multi-standard applications. Simulation results show that the proposed architecture has good tolerance against parameter mismatches and nonlinearities in the multi-bit DAC.
Keywords :
circuit noise; delta-sigma modulation; quantisation (signal); transfer functions; multibit DAC; multibit quantizers; multistandard applications; noise transfer function; over-sampling ratio; parameter choices; parameter mismatches; three-stage multistage noise shaping; wideband delta-sigma modulator; Additive noise; Delta modulation; Dynamic range; Integrated circuit noise; Multi-stage noise shaping; Noise cancellation; Quantization; Signal resolution; Transfer functions; Wideband;
Conference_Titel :
Circuits and Systems, 2004. MWSCAS '04. The 2004 47th Midwest Symposium on
Print_ISBN :
0-7803-8346-X
DOI :
10.1109/MWSCAS.2004.1354119
