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An Energy-Efficient Discrete-Time DeltaSigma Modulator With Dynamic-Range Enhanc
提出一种动态范围增强的离散时间ΔΣ调制器，适用于物联网应用，具有高能效和低功耗特性。
94.7dB动态范围, 92.4dB SNDR, 700Hz带宽, 2.3μW功耗
ΔΣ调制器动态范围增强物联网低功耗SAR量化器
▸基于异步1.5位SAR量化器的动态范围增强技术
▸采用可变阈值(VTH)技术优化不同输入幅度下的性能
▸改进级联浮动反相放大器(FIA)在弱反型区的工作模型
Abstract
This article presents a dynamic range (DR)
enhanced discrete-time delta–sigma modulator (DTDSM) applied
to the Internet of Things (IoT). It is based on an asynchronous
1.5-bit successive-approximation-resister (SAR) quantizer and a
tri-level feedback capacitive digital-to-analog converter (CDAC),
eliminating the dynamic element matching (DEM) overhead.
The proposed DR enhancement (DRE) technique based on a
variable threshold ( VTH) allows the system to achieve maximum
benefits at different input