An Energy-Efficient Capacitive Sensor Readout Circuit With Zoomed Time-Domain Quantization

IF 2.2 Q3 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE
Zilong Shen;Xiyuan Tang;Zhongyi Wu;Haoyang Luo;Zongnan Wang;Xiangxing Yang;Xing Zhang;Yuan Wang
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引用次数: 0

Abstract

This letter presents a capacitance-to-digital converter (CDC) with an incremental zoom current-controlled oscillator (CCO)-based time-domain $\Delta \Sigma $ modulator (TD- $\Delta \Sigma \text{M}$ ). It supports single-sensor and single-shot measurement, which provides significant power saving. A double-PFD (DPFD) quantizer achieves $2\times $ resolution enhancement compared to conventional PFD. A fast start-up scheme for CCO boosts conversion speed and ensures first conversion accuracy. The proposed design achieves 9.7 fJ/conv.-step with a short measurement time of $4.1~\mu \text{s}$ . To the authors’ best knowledge, it realizes the best energy efficiency and shortest measurement time among all high-resolution CDCs achieving over 12 ENOB.
一种具有放大时域量化的高效电容式传感器读出电路
这封信介绍了一种电容-数字转换器(CDC),该转换器具有基于增量缩放电流控制振荡器(CCO)的时域$\Delta\Sigma$调制器(TD-$\Delta \Sigma\text{M}$)。它支持单传感器和单次测量,可显著节省电源。与传统PFD相比,双PFD(DPFD)量化器的分辨率提高了2倍。CCO的快速启动方案提高了转换速度,并确保了首次转换的准确性。所提出的设计实现了9.7fJ/conv-步骤,测量时间短,为$4.1~\mu\text{s}$。据作者所知,在所有达到12 ENOB以上的高分辨率CDCs中,它实现了最佳的能效和最短的测量时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IEEE Solid-State Circuits Letters
IEEE Solid-State Circuits Letters Engineering-Electrical and Electronic Engineering
CiteScore
4.30
自引率
3.70%
发文量
52
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