改进的宽带低失真级联δ - σ调制器

Fifth International Workshop on System-on-Chip for Real-Time Applications (IWSOC'05) Pub Date : 2005-07-20 DOI:10.1109/IWSOC.2005.75

Xiaolong Yuan, A. Gothenberg, Xiaobo Wu

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引用次数: 2

摘要

在宽带δ - σ调制器中对输入信号进行前馈，使积分器只处理量化误差，这是近年来非常流行的一种方法。优点是实际信号不受运放和积分器非线性的影响。在本文中，我们着重于改进的前馈技术用于级联delta-sigma调制器。基于单位增益信号传递函数(STF)和优化噪声传递函数(NTF)置零，采用/spl lambda/-分析，提出了一种前馈级联结构。该结构在整个输入范围内提高了信噪比(SNR)。

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Improved wideband low distortion cascaded delta-sigma modulator

It has recently become very popular to feedforward the input signal in wideband delta-sigma modulators, so that the integrators only process quantization errors. The advantage being that the actual signal is not distorted by opamp and integrator nonlinearities. In this paper, we focus on improved feedforward techniques for cascaded delta-sigma modulators. A feedforward cascaded structure is presented based on unity-gain signal transfer function (STF) and optimized noise transfer function (NTF) zero placement, using /spl lambda/-analysis. The proposed structure has improved signal-to-noise-ratio (SNR) across the entire input range.

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Fifth International Workshop on System-on-Chip for Real-Time Applications (IWSOC'05)

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