NDLI: On reducing leakage quantization noise of multistage /spl Sigma//spl Delta/ modulator using nonlinear oscillation

Content Provider	IEEE Xplore Digital Library
Author	Teng-Hung Chang Lan-Rong Dung Jwin-Yen Guo
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan (Teng-Hung Chang; Lan-Rong Dung)
Abstract	The paper presents an improved architecture of multistage (MASH) multibit sigma-delta modulators (/spl Sigma//spl Delta/Ms). The architecture can be immune to circuit nonidealities over a large portion of input range when the oversampling ratio (OSR) is low, and hence the dynamic range (DR) can be improved. Our approach is based on two resonator topologies, high-Q cascade-of-resonator-with-feedforward (HQCRFF) and low-Q cascade-of-integrator-with-feedforward (LQCIFF). The key to improving DR is to use an HQCRFF-based single-bit structure in the first stage and have the first stage oscillate. When the first stage oscillates, the coarse quantization noise vanishes and hence circuit nonidealities, such as finite op-amp gain and capacitor mismatching, do not cause leakage quantization noise problems. In addition, because of the in-band zeros introduced by the resonators, the proposed architecture enhances the suppression of the in-band quantization noise for wideband applications. As the results of simulation, the proposed MASH architecture can inherently have wide DR without using additional calibration techniques.
Starting Page	2555
Ending Page	2558
File Size	381678
Page Count	4
File Format	PDF
ISBN	0780388348
DOI	10.1109/ISCAS.2005.1465147
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-05-23
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quantization Noise reduction Circuit noise Multi-stage noise shaping Delta-sigma modulation Dynamic range Circuit topology Operational amplifiers Capacitors Wideband
Content Type	Text
Resource Type	Article

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