A single DAC CT sigma-delta modulator with Butterworth STF characteristic
A single DAC CT sigma-delta modulator with Butterworth STF characteristic
复制标题
具有巴特沃斯 STF 特性的单 DAC CT Σ-Δ 调制器
DOI：
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发表时间：
2011
期刊：
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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：
Tim Brueckner;C. Zorn;W. Mathis;M. Ortmanns
本文提出了一种连续时间Sigma-Delta调制器滤波器结构，它结合了已知的前馈结构和额外环路延迟（ELD）补偿技术，以实现具有巴特沃思信号传输特性的ELD补偿调制器，其仅采用一个数模转换器（DAC），给出了系数值的映射策略，并通过仿真评估了示例性调制器。与具有前馈滤波器结构和用于ELD补偿的附加反馈路径的调制器进行比较。此外，对系数变化的敏感性进行了研究。
In this paper a continuous time Sigma-Delta modulator filter structure is proposed, which combines the known feed forward structure and an excess loop delay (ELD) compensation technique in order to realize an ELD compensated modulator with Butterworth signal transfer characteristic, which employs only one digital to analog converter (DAC) in the feedback path. A mapping strategy for the coefficient values is given and an exemplary modulator is evaluated through simulation. It is compared to a modulator with feed forward filter structure and an additional feedback path for ELD compensation. Furthermore an investigation on the sensitivity to coefficient variation is presented.