3.7 A 10mW 16b 15MS/s Two-Step SAR ADC with 95dB DR Using Dual-Deadzone Ring-Amplifier
3.7 A 10mW 16b 15MS/s Two-Step SAR ADC with 95dB DR Using Dual-Deadzone Ring-Amplifier
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DOI：
10.1109/isscc.2019.8662400
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
A. ElShater;C. Lee;Praveen Kumar Venkatachala;J. Muhlestein;Spencer Leuenberger;Kazuki Sobue;K. Hamashita;U. Moon
中科院分区：
文献类型：
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作者：
A. ElShater;C. Lee;Praveen Kumar Venkatachala;J. Muhlestein;Spencer Leuenberger;Kazuki Sobue;K. Hamashita;U. Moon
两步SAR架构一直是医学成像等应用中高能效ADC的热门选择。SAR ADC的架构简单且可扩展，每级可实现高效的多位转换[1，2]，但两步SAR的最大性能受到残差放大器的限制。环形放大器（RAMP）实现了高效的两步SAR ADC [3]。尽管如此，基于RAM的高精度ADC（> 16 b）仍然未被开发。本文提出了一种两步SAR ADC，利用全差分RAMP实现95 dB DR。两种技术，有助于提高ADC的能量效率也提出了：动态数字电源和DAC阻抗匹配。
The two-step SAR architecture has been a popular choice for power-efficient ADCs used in applications such as medical imaging. The simple and scalable architecture of the SAR ADC enables efficient multi-bit conversion per stage [1, 2] however, the maximum performance of the two-step SAR is limited by the residue amplifier. The ring amplifier (RAMP) has enabled efficient two-step SAR ADCs [3]. Despite this, RAMP-based high-precision ADCs (>16b) remain unexplored. This paper presents a two-step SAR ADC utilizing a fully differential RAMP achieving 95dB DR. Two techniques that contribute to the energy-efficiency of the ADC are also presented: dynamic digital supply and DAC impedance-matching.