Discrete-time simulation of arbitrary digital/analog converter waveforms in continuous-time sigma-delta modulators
Discrete-time simulation of arbitrary digital/analog converter waveforms in continuous-time sigma-delta modulators
复制标题
连续时间 Σ-Δ 调制器中任意数字/模拟转换器波形的离散时间仿真
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Ortmanns
中科院分区：
文献类型：
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作者：
Timon Brückner;Martin Kiebler;C. Zorn;W. Mathis;M. Ortmanns
本文研究了将任意反馈脉冲引入连续时间Sigma-Delta调制器的离散时间仿真方法。虽然矩形反馈脉冲覆盖了大多数已发表的Sigma-Delta调制器电路，但其他波形形状也具有众所周知的优势，例如降低了对反馈路径中过多环路延迟的敏感度、运算放大器中的有限增益带宽和时钟抖动。为了在非矩形数模转换器波形的情况下利用连续时间调制器的快速离散时间仿真的优点，这项工作为精确建模提供了数学背景。对比模拟表明，速度优势最高可达三个数量级以上。
In this paper, the inclusion of arbitrary feedback pulses into the method of discrete-time simulation of continuous-time sigma-delta modulator is investigated. Although rectangular feedback pulses cover the majority of the published sigma-delta modulator circuits, there arise well known advantages from other waveform shapes, such as reduced sensitivity to excess-loop-delay in the feedback path, finite gain bandwidths in the operational amplifiers and clock-jitter. In order to also utilize the benefit of fast discrete-time simulations of continuous-time modulators in the case of non-rectangular digital-to-analog converter waveforms, this work provides the mathematical background for accurate modeling. Comparative simulations show a speed advantage of up to more than three order of magnitude.