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Cascaded feedforward sigma-delta modulator for wide bandwidth applications

机译:级联前馈Σ-Δ调制器,适用于宽带应用

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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,我们提出了一种适用于宽带应用的级联前馈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的量化误差,但是该误差可以在数字部分中消除。在这里,使用具有最小均方算法的自适应滤波器来减少非线性效应。仿真结果表明,该架构的SNDR与具有多位DAC的理想前馈求和sigma-delta调制器的SNDR非常接近,可用于宽带宽应用。

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