SAR-Assisted Energy-Efficient Hybrid ADCs

Kent Edrian Lozada;Dong-Jin Chang;Dong-Ryeol Oh;Min-Jae Seo;Seung-Tak Ryu
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Abstract

The distinct advantages of low power consumption and hardware compactness make SAR ADCs especially appealing in scaled CMOS technologies, garnering significant attention. The residue left on the capacitor digital-to-analog converter (CDAC) after conversion in the SAR ADC negates the need for complex residue extraction circuits. This crucial feature has inspired numerous SAR-assisted architectural variations, employed in a range of applications from high resolution to high speed. This article introduces several energy-efficient hybrid ADC architectures that incorporate SAR ADCs as their sub blocks, including the following: SAR-assisted subranging SAR, which saves DAC switching power and can detect skew errors for time-interleaved ADCs; SAR-flash hybrid for energy-efficient high-speed conversion; SAR-assisted dual-residue pipelined ADC, which eliminates the stringent requirement for residue gain accuracy; and SAR-assisted delta–sigma modulator (DSM) with digital-domain noise coupling, which reduces the number of required analog integrators.
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SAR 辅助型高能效混合 ADC
SAR ADC 具有功耗低、硬件结构紧凑等显著优势,因此在按比例 CMOS 技术中尤其具有吸引力,备受关注。SAR ADC 在转换后会在电容数模转换器 (CDAC) 上留下残留物,因此无需复杂的残留物提取电路。这一关键特性激发了众多 SAR 辅助架构的变化,并被应用于从高分辨率到高速度的一系列应用中。本文介绍了几种将 SAR ADC 作为子模块的高能效混合 ADC 架构,包括以下几种:SAR 辅助亚量程 SAR,可节省 DAC 开关电源,并能检测时间交错 ADC 的偏斜误差;SAR-闪存混合,可实现高能效高速转换;SAR 辅助双残差流水线 ADC,可消除对残差增益精度的严格要求;以及 SAR 辅助三角积分调制器 (DSM),具有数域噪声耦合功能,可减少所需的模拟积分器数量。
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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