一个ΔΣ调制器与3位,37级预检测动态量化

Chien-Hung Kuo, Kuan Wang
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引用次数: 0

摘要

本文提出了一种带预检测动态量化器的高分辨率δ - σ调制器。在提出的动态量化器中,仅使用3位量化器就可以实现37级量化。在所提出的结构中,在所提出的调制器的输入端增加一个信号检测器来预检测采样输入的幅度,并将动态量化器切换到相应的量化范围。采用所提出的技术,量化水平可以大大提高,因此,比较器的数量将大大减少,以实现高水平的量化。因此,δ - σ调制器的分辨率可以在不消耗太多功率和面积的情况下显著提高。delta-sigma调制器采用台积电0.18 μm 1P6M CMOS工艺实现。在25khz的信号频带中,信噪加失真比为101.2 dB。在1.8 V供电电压下,功耗为1.68 mW。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A ΔΣ modulator with 3-Bit, 37-level pre-detective dynamic quantization
In this paper, a high-resolution delta-sigma modulator with a pre-detective dynamic quantizer is proposed. A 37-level quantization can be achieved by using only a 3-bit quantizer in the proposed dynamic quantizer. In the proposed structure, a signal detector is added at the input of the presented modulator to pre-detect the magnitude of the sampled input and switch the dynamic quantizer to the corresponding quantization range. With the proposed technique, the quantization level can be greatly increased, and the number of comparators will hence be substantially reduced for a high-level quantization. The resulting resolution of delta-sigma modulators can thus be significantly promoted without consuming much power and area. The proposed delta-sigma modulator is implemented in a TSMC 0.18-μm 1P6M CMOS process. The signal-to-noise plus distortion ratio is 101.2 dB in a signal band of 25 kHz. The power consumption is 1.68 mW at a 1.8 V supply voltage.
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