NDLI: A novel cascade sigma-delta modulator architecture for broadband applications

Content Provider	IEEE Xplore Digital Library
Author	Xiao Yang Guican Chen Jun Cheng Hong Zhang
Copyright Year	2007
Description	Author affiliation: Xi'an Jiaotong Univ., Xi'an (Xiao Yang; Guican Chen; Jun Cheng; Hong Zhang)
Abstract	In this paper, a novel 2-3 two-stage fifth-order multi-bit cascade sigma-delta modulator (SDM) architecture is proposed for broadband applications. For low oversampling applications, in order to resolve the problem of the sensitivity to the nonlinear and finite gain of operational amplifier (op-amp) in the traditional cascade SDM architecture, the first stage of the proposed SDM architecture employs a second-order low-distortion multi-bit SDM. While the second stage employs a single-loop third-order multi-bit SDM instead of a first-order or second-order SDM, which can simplify the analog circuit significantly. The noise transfer function and the interstage gain between the first stage and second stage are carefully designed for stability considerations. Furthermore, the simplified digital cancellation logics can be achieved. Simulation results show that this SDM architecture is insensitive to the nonlinear and finite gain of op-amp.
Starting Page	101
Ending Page	105
File Size	270083
Page Count	5
File Format	PDF
ISBN	9781424409761
DOI	10.1109/ISCIT.2007.4391993
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-17
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Operational amplifiers Broadband amplifiers Circuit simulation Transfer functions Analog circuits Delta-sigma modulation Noise cancellation Circuit noise Circuit stability Logic
Content Type	Text
Resource Type	Article

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