无杂散动态范围
放大器
逐次逼近ADC
电子工程
噪声整形
有效位数
动态范围
电容器
过采样
电气工程
计算机科学
拓扑(电路)
CMOS芯片
工程类
电压
作者
Hanyue Li,Yu-Ting Shen,Haoming Xin,Eugenio Cantatore,Pieter Harpe
出处
期刊:IEEE Journal of Solid-state Circuits
[Institute of Electrical and Electronics Engineers]
日期:2022-07-01
卷期号:57 (7): 2078-2089
被引量:3
标识
DOI:10.1109/jssc.2022.3168588
摘要
This article presents a second-order noise-shaping successive-approximation-register (SAR) analog-to-digital converter (ADC) that employs a duty-cycled amplifier and digital-predicted mismatch error shaping (MES). The loop filter is composed of an active amplifier and two cascaded passive integrators to provide a theoretical 30-dB in-band noise attenuation. The amplifier achieves $18\times $ gain in a power-efficient way thanks to its inverter-based topology and duty-cycled operation. The capacitor mismatch in the digital-to-analog converter (DAC) array is mitigated by first-order MES. A two-level digital prediction scheme is adopted with MES to avoid input range loss. Fabricated in 65-nm CMOS technology, the prototype achieves 80-dB peak signal-to-noise-and-distortion-ratio (SNDR) and 98-dB peak spurious-free-dynamic-range (SFDR) in a 31.25-kHz bandwidth with $16\times $ oversampling ratio (OSR), leading to a Schreier figure-of-merit (FoM) of 176.3 dB and a Walden FoM of 14.3 fJ/conversion-step.
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