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A circuit based behavioral modeling of Continuous-Time Sigma Delta modulators

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A circuit based behavioral modeling of Continuous-Time Sigma Delta modulators

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Title: A circuit based behavioral modeling of Continuous-Time Sigma Delta modulators
Author: Leow, Yoon Hwee; Zhang, Fan; Teh, Li Lian; Siek, Liter
Copyright year: 2009
Abstract: In evaluating Continuous-Time Sigma Delta (ΣΔ) Modulators, the generation of highly accurate results requires long simulation time due to the nonlinear nature of the system. In most cases, a compromise has to be made to trade off precision for speed [2]. This paper presents a circuit-based high level model implemented in the MATLAB SIMULINK environment so as to achieve a faster speed of simulation. Designed in a differential manner, the model provides good visualization of the actual circuit at the early stage of design. To maintain simulation accuracy, circuit nonidealities such as system clock jitter, integrator noise, opamp finite gain, bandwidth and slew rate as well as the digital to analog converter (DAC) mismatches are included in the model. For demonstration purpose, a 4th order CT ΣΔ modulator with NRZ (Non-Return to Zero) architecture is implemented. With the proposed models, key design specifications for the functional building blocks are derived.
Subject: DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits.
Type: Conference Paper
Conference name: IEEE International Symposium on Integrated Circuits (12th : 2009 : Singapore)
School: School of Electrical and Electronic Engineering
Rights: © 2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. http://www.ieee.org/portal/site This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
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