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首页> 外文期刊>IEEE Journal of Solid-State Circuits >A 50-MHz multibit sigma-delta modulator for 12-b 2-MHz A/D conversion
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A 50-MHz multibit sigma-delta modulator for 12-b 2-MHz A/D conversion

机译:用于12b 2MHz A / D转换的50MHz多位Σ-Δ调制器

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摘要

The authors examine the application of oversampling techniques to analog-to-digital conversion at rates exceeding 1 MHz. A cascaded multibit sigma-delta ( Sigma Delta ) modulator that substantially reduces the oversampling ratio required for 12-b conversion while avoiding stringent component matching requirements is introduced. Issues concerning the design and implementation of the modulator are presented. At a sampling rate of 50 MHz and an oversampling ratio of 24, an implementation of the modulator in a 1- mu m CMOS technology achieves a dynamic range of 74 dB at a Nyquist conversion rate of 2.1 MHz. The experimental modulator is a fully differential circuit that operates from a single 5-V power supply and does not require calibration or component trimming.
机译:作者研究了过采样技术在速率超过1 MHz的模数转换中的应用。引入了级联的多位sigma-delta(Sigma Delta)调制器,该调制器可大大降低12-b转换所需的过采样率,同时又避免了严格的组件匹配要求。提出了有关调制器设计和实现的问题。在50 MHz的采样率和24的过采样率下,以1μmCMOS技术实现的调制器在2.1 MHz的奈奎斯特转换率下可实现74 dB的动态范围。实验性调制器是一个全差分电路,可通过5V单电源供电,无需校准或组件调整。

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