An Energy-Efficient, High-Resolution kT/C-Noise-Canceled Pipelined-SAR Capacitance-to-Digital Converter With Incomplete-Settling-Based Correlated Level Shifting in 22-nm CMOS

被引：0

作者：

Gao, Jihang ^{[1
]}

Ye, Siyuan ^{[1
]}

Li, Jie ^{[1
]}

Xu, Xinhang ^{[1
]}

Chen, Zhuoyi ^{[1
]}

Cui, Jiajia ^{[1
]}

Luan, Yaohui ^{[1
]}

Huang, Ru ^{[1
]}

Ye, Le ^{[2
,3
]}

Shen, Linxiao ^{[1
]}

机构：

[1] Peking Univ, Sch Integrated Circuits, Beijing 100871, Peoples R China

[2] Peking Univ, Sch Integrated Circuits, Beijing 100871, Peoples R China

[3] Peking Univ, Adv Inst Informat Technol, Hangzhou 310005, Peoples R China

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2024年

基金：

中国国家自然科学基金;

关键词：

Noise; Noise cancellation; Capacitance; Bandwidth; Sensors; Topology; Energy efficiency; Background calibration; capacitance-to-digital converter (CDC); correlated-level-shifting (CLS); kT/C noise cancellation; pipelined-successive-approximation-register (SAR); ADC; SENSOR;

D O I：

10.1109/JSSC.2024.3422671

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This article presents a high-resolution and energy-efficient pipelined-successive-approximation-register (SAR) capacitance-to-digital converter (CDC). The converter uses a two-stage SAR analog-to-digital converter (ADC) and a residue amplifier (RA) to effectively convert the input signal. To mitigate the impact of kT/C noise during the sampling process, an enhanced kT/C noise cancellation technique is used within a pipelined-SAR architecture. In addition, an innovative incomplete-settling-based correlated-level-shifting (ISCLS) technique is proposed to achieve an equivalent open-loop gain of over 80 dB, thereby enhancing power efficiency and amplification accuracy. Furthermore, a background calibration loop is proposed to track PVT changes and ensure high-precision amplification under PVT variations to ensure PVT stability. The proposed CDC is implemented in a 22-nm CMOS process. The prototype achieves a resolution of 37.12 aF under 384-fF input capacitance with 4.71 mu W, resulting in a Walden figure-of-merit (FoMw) of 7.9 fJ/conv.-step, which represents more than a twofold improvement compared with previous sub-fF resolution CDCs.

引用

页数：14