標題: Modeling Harmonic Distortions Caused by Nonlinear Op-Amp DC Gain for Switched-Capacitor Sigma-Delta Modulators
作者: Chen, Fu-Chuang
Hsieh, Chih-Lung
電控工程研究所
Institute of Electrical and Control Engineering
關鍵字: Nonlinear distortion;op-amp dc gain;sigma-delta modulator (SDM)
公開日期: 1-Sep-2009
摘要: Op-amps are crucial components in sigma-delta modulators (SDMs). As device dimensions and supply voltages continue to scale down, it is increasingly critical to determine a suitable op-amp dc gain. If the dc gain is set too high, then the op-amp consumes too much power; if the dc gain is too small, then nonlinear distortion becomes serious. However, there exists no efficient approach for selecting dc gains. In this brief, we propose to use a nonlinear function to model nonlinear op-amp dc gain curves. Then, this nonlinear function is employed to derive an SDM nonlinear distortion model as a function of SDM system parameters. The obtained SDM nonlinear distortion model can subsequently be used to compute the minimum required op-amp dc gain such that nonlinear distortions are kept under a tolerable value. The nonlinear dc gain curve model and the SDM nonlinear distortion model proposed in this brief are verified by behavior simulations and transistor-level simulations.
URI: http://dx.doi.org/10.1109/TCSII.2009.2027956
http://hdl.handle.net/11536/6756
ISSN: 1549-7747
DOI: 10.1109/TCSII.2009.2027956
期刊: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume: 56
Issue: 9
起始頁: 694
結束頁: 698
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