Cascaded feedforward sigma-delta modulator for wide bandwidth applications

机译：用于宽带宽应用的级联馈送Sigma-Delta调制器

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In this paper, we propose a cascaded feedforward sigma-delta modulator for wide bandwidth applications. In our proposed approach, we use a 1.5-bit quantizer as feedback in the multi-bit sigma-delta modulator. The 1.5-bit feedback may cause coarse quantization errors, however the error can be canceled in the digital part. Here an adaptive filter with least mean square algorithm is used to reduce the nonlinear effect. The simulation results show that the SNDR of this architecture is very close to that of the ideal feedforward summation sigma-delta modulator with multi-bit DAC and can be used for the wide bandwidth application.

机译：在本文中，我们提出了一种用于宽带宽应用的级联的馈送Sigma-Delta调制器。在我们提出的方法中，我们使用1.5位量化器作为多位Sigma-Delta调制器中的反馈。 1.5位反馈可能导致粗略量化误差，但是在数字部分中可以取消错误。这里使用具有最小均方算法的自适应滤波器来减少非线性效果。仿真结果表明，这种架构的SNDR非常接近具有多位DAC的理想前馈求和Sigma-Delta调制器的SNDR，可用于宽带宽应用。

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《IEEE International Conference on Electronics, Circuits and Systems》|2001年||共4页
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Jen-Shiun Chiang; Pou-Chu Chou; Teng-Hung Chang;
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中图分类 TN4-53;
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Cascaded feedforward sigma-delta modulator for wide bandwidth applications

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