tailieunhanh - Báo cáo hóa học: " Research Article Multirate Formulation for Mismatch Sensitivity Analysis of Analog-to-Digital Converters That Utilize Parallel ΣΔ-Modulators"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Multirate Formulation for Mismatch Sensitivity Analysis of Analog-to-Digital Converters That Utilize Parallel ΣΔ-Modulators | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 289184 11 pages doi 2008 289184 Research Article Multirate Formulation for Mismatch Sensitivity Analysis of Analog-to-Digital Converters That Utilize Parallel XA-Modulators Anton Blad Hakan Johansson and Per Lowenborg Division of Electronics Systems Department of Electrical Engineering Linkoping University Sweden Correspondence should be addressed to Anton Blad antonb@ Received 1 June 2007 Accepted 21 October 2007 Recommended by Boris Murmann A general formulation based on multirate filterbank theory for analog-to-digital converters using parallel sigmadelta modulators in conjunction with modulation sequences is presented. The time-interleaved modulators TIMs Hadamard modulators HMs and frequency-band decomposition modulators FBDMs can be viewed as special cases of the proposed description. The usefulness of the formulation stems from its ability to analyze a system s sensitivity to aliasing due to channel mismatch and modulation sequence level errors. Both Nyquist-rate and oversampled systems are considered and it is shown how the matching requirements between channels can be reduced for oversampled systems. The new formulation is useful also for the derivation of new modulation schemes and an example is given of how it can be used in this context. Copyright 2008 Anton Blad et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Traditionally analog-to-digital converters ADCs and digital-to-analog converters DACs based on XA-modula-tion have been used primarily for low bandwidth and high-resolution applications such as audio application. The requirements make the architecture perfectly suited for this purpose. However in later years advancements in VLSI technology have .