A Third-Order DT ΔΣ Modulator Using Noise-Shaped Bidirectional Single-Slope Quantizer

📋 论文概要

本文提出了一种采用噪声整形双向单斜率量化器的三阶离散时间ΔΣ调制器。该结构结合了时间域量化和噪声整形技术，克服了VCO量化器的非线性问题以及传统时间域量化缺乏噪声整形的缺陷。

💡 主要创新点

• 提出了一种噪声整形双向单斜率量化器，实现时间域量化与噪声整形的结合。
• 该量化器避免了VCO量化器的非线性行为，同时提供了额外的噪声整形，提升了调制器的能效和线性度。

🏷 关键词

📄 原文摘要

The aspirations for power efficient ADCs have led to many improvements in this area. In delta-sigma modulators, techniques such as VCO-based quantizer [1, 2] and time-domain quantization [3] have been proposed to enhance the overall performance. The former provides additional noise shaping and the latter eliminates the need for the flash ADC. However, in addition to process and temperature variations, the inherent nonlinear behavior of the VCO requires careful attention. The time-domain quantization technique is an efficient way to utilize the quantizer but it does not improve the noise-shaping property. In this paper, we describe modified dual-slope and single-slope ADCs using bidirectional discharging. With a small modification in the discharging phase of these types of ADCs, a first-order quantization noise shaping is attained. These structures may be used as standalone ADCs or as the quantizer in a delta-sigma loop. Moreover,

👥 作者与机构

Nima Maghari, Un-Ku Moon

Oregon State University, Corvallis, OR