连续时间σ - δ调制器的鲁棒NTF设计

M. Mirzaei, H. Shamsi
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引用次数: 0

摘要

本文对低功耗、鲁棒连续时间σ - δ调制器的设计进行了新颖的经验分析研究。该方法使调制器对反馈环路的过量环路延迟更稳定。此外,它对调制器的运算放大器施加了简单的约束,从而可以实现与调制器采样频率相同的单位增益带宽的运算放大器。为了设计更稳定的噪声传递函数(NTF),该方法同时采用了相位裕度(PM)和增益裕度(GM)稳定准则。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Robust NTF design for continuous time Sigma-Delta modulators
In this paper, a novel empirical-analytical study is performed on the design of low power and robust continuous time Sigma-Delta modulators. The proposed method makes the modulators more stable against the excess loop delay of the feedback loop. Besides, it enforces easy constraints on op-amps of the modulator so that we can realize the op-amps with a unity gain bandwidth identical to the sampling frequency of the modulator. In order to design a more stable Noise Transfer Function (NTF), this method employs both the phase margin (PM) and gain margin (GM) stability criteria.
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