A 108.9dB-DR, 2-2 MASH ADC Featuring a Nested Gainboosting FIA with Gm Enhancement in Settling Phase Through Stepwise Charge Sharing

Yuming Li; Lichenxi Zhang; Youxiang Chen; Kelei Zhang; Rui Pan; Junyao Ji; Jie Zhang; Xiaofei Wang; Hong Zhang

doi:10.1109/CICC65509.2026.11509552

A 108.9dB-DR, 2-2 MASH ADC Featuring a Nested Gainboosting FIA with G_m Enhancement in Settling Phase Through Stepwise Charge Sharing

Yuming Li
, Lichenxi Zhang
, Youxiang Chen
, Kelei Zhang
, Rui Pan
, Junyao Ji
, Jie Zhang
, Xiaofei Wang
, Hong Zhang

Xi'an Jiaotong University
Ltd.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

This paper presents a 2-2 multistage noise-shaping (MASH) ADC featuring a nested gain-boosting floating inverter amplifier (NGB-FIA) to fulfill the high-gain (>100dB) and low-power requirement. To achieve better utilization of the energy stored on the reservoir capacitor, a stepwise charge sharing scheme is further proposed in the NGB-FIA, which enhances the transconductance (G_m) by 37% during the settling phase of the integrator. Fabricated in a 180-nm CMOS process, the ADC achieves 107.4-dB SNDR and 108.9-dB dynamic range (DR) in a 16-kHz bandwidth while consuming 325.1 μW. This translates into a Schreier figure of merit (FoM_S) of 185.8 dB and a FoM_SNDR of 184.3 dB.

Original language	English
Title of host publication	2026 IEEE Custom Integrated Circuits Conference, CICC 2026 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9798331572105
DOIs	https://doi.org/10.1109/CICC65509.2026.11509552
State	Published - 2026
Externally published	Yes
Event	46th Annual IEEE Custom Integrated Circuits Conference, CICC 2026 - Seattle, United States Duration: 19 Apr 2026 → 23 Apr 2026

Publication series

Name	Proceedings of the Custom Integrated Circuits Conference
ISSN (Print)	0886-5930

Conference

Conference	46th Annual IEEE Custom Integrated Circuits Conference, CICC 2026
Country/Territory	United States
City	Seattle
Period	19/04/26 → 23/04/26

Keywords

A/D conversion
floating inverter amplifier (FIA)
fully dynamic
multistage noise-shaping
switched capacitor (SC)

Access to Document

10.1109/CICC65509.2026.11509552

Cite this

Li, Y., Zhang, L., Chen, Y., Zhang, K., Pan, R., Ji, J., Zhang, J., Wang, X., & Zhang, H. (2026). A 108.9dB-DR, 2-2 MASH ADC Featuring a Nested Gainboosting FIA with G_m Enhancement in Settling Phase Through Stepwise Charge Sharing. In 2026 IEEE Custom Integrated Circuits Conference, CICC 2026 - Proceedings (Proceedings of the Custom Integrated Circuits Conference). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CICC65509.2026.11509552

Li, Yuming ; Zhang, Lichenxi ; Chen, Youxiang et al. / A 108.9dB-DR, 2-2 MASH ADC Featuring a Nested Gainboosting FIA with G_m Enhancement in Settling Phase Through Stepwise Charge Sharing. 2026 IEEE Custom Integrated Circuits Conference, CICC 2026 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2026. (Proceedings of the Custom Integrated Circuits Conference).

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title = "A 108.9dB-DR, 2-2 MASH ADC Featuring a Nested Gainboosting FIA with Gm Enhancement in Settling Phase Through Stepwise Charge Sharing",

abstract = "This paper presents a 2-2 multistage noise-shaping (MASH) ADC featuring a nested gain-boosting floating inverter amplifier (NGB-FIA) to fulfill the high-gain (>100dB) and low-power requirement. To achieve better utilization of the energy stored on the reservoir capacitor, a stepwise charge sharing scheme is further proposed in the NGB-FIA, which enhances the transconductance (Gm) by 37\% during the settling phase of the integrator. Fabricated in a 180-nm CMOS process, the ADC achieves 107.4-dB SNDR and 108.9-dB dynamic range (DR) in a 16-kHz bandwidth while consuming 325.1 μW. This translates into a Schreier figure of merit (FoMS) of 185.8 dB and a FoMSNDR of 184.3 dB.",

keywords = "A/D conversion, floating inverter amplifier (FIA), fully dynamic, multistage noise-shaping, switched capacitor (SC)",

author = "Yuming Li and Lichenxi Zhang and Youxiang Chen and Kelei Zhang and Rui Pan and Junyao Ji and Jie Zhang and Xiaofei Wang and Hong Zhang",

note = "Publisher Copyright: {\textcopyright} 2026 IEEE.; 46th Annual IEEE Custom Integrated Circuits Conference, CICC 2026 ; Conference date: 19-04-2026 Through 23-04-2026",

year = "2026",

doi = "10.1109/CICC65509.2026.11509552",

language = "英语",

series = "Proceedings of the Custom Integrated Circuits Conference",

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booktitle = "2026 IEEE Custom Integrated Circuits Conference, CICC 2026 - Proceedings",

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Li, Y, Zhang, L, Chen, Y, Zhang, K, Pan, R, Ji, J, Zhang, J, Wang, X & Zhang, H 2026, A 108.9dB-DR, 2-2 MASH ADC Featuring a Nested Gainboosting FIA with G_m Enhancement in Settling Phase Through Stepwise Charge Sharing. in 2026 IEEE Custom Integrated Circuits Conference, CICC 2026 - Proceedings. Proceedings of the Custom Integrated Circuits Conference, Institute of Electrical and Electronics Engineers Inc., 46th Annual IEEE Custom Integrated Circuits Conference, CICC 2026, Seattle, United States, 19/04/26. https://doi.org/10.1109/CICC65509.2026.11509552

A 108.9dB-DR, 2-2 MASH ADC Featuring a Nested Gainboosting FIA with G_m Enhancement in Settling Phase Through Stepwise Charge Sharing. / Li, Yuming; Zhang, Lichenxi; Chen, Youxiang et al.
2026 IEEE Custom Integrated Circuits Conference, CICC 2026 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2026. (Proceedings of the Custom Integrated Circuits Conference).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Li, Yuming

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AU - Chen, Youxiang

AU - Zhang, Kelei

AU - Pan, Rui

AU - Ji, Junyao

AU - Zhang, Jie

AU - Wang, Xiaofei

AU - Zhang, Hong

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N2 - This paper presents a 2-2 multistage noise-shaping (MASH) ADC featuring a nested gain-boosting floating inverter amplifier (NGB-FIA) to fulfill the high-gain (>100dB) and low-power requirement. To achieve better utilization of the energy stored on the reservoir capacitor, a stepwise charge sharing scheme is further proposed in the NGB-FIA, which enhances the transconductance (Gm) by 37% during the settling phase of the integrator. Fabricated in a 180-nm CMOS process, the ADC achieves 107.4-dB SNDR and 108.9-dB dynamic range (DR) in a 16-kHz bandwidth while consuming 325.1 μW. This translates into a Schreier figure of merit (FoMS) of 185.8 dB and a FoMSNDR of 184.3 dB.

AB - This paper presents a 2-2 multistage noise-shaping (MASH) ADC featuring a nested gain-boosting floating inverter amplifier (NGB-FIA) to fulfill the high-gain (>100dB) and low-power requirement. To achieve better utilization of the energy stored on the reservoir capacitor, a stepwise charge sharing scheme is further proposed in the NGB-FIA, which enhances the transconductance (Gm) by 37% during the settling phase of the integrator. Fabricated in a 180-nm CMOS process, the ADC achieves 107.4-dB SNDR and 108.9-dB dynamic range (DR) in a 16-kHz bandwidth while consuming 325.1 μW. This translates into a Schreier figure of merit (FoMS) of 185.8 dB and a FoMSNDR of 184.3 dB.

KW - A/D conversion

KW - floating inverter amplifier (FIA)

KW - fully dynamic

KW - multistage noise-shaping

KW - switched capacitor (SC)

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T3 - Proceedings of the Custom Integrated Circuits Conference

BT - 2026 IEEE Custom Integrated Circuits Conference, CICC 2026 - Proceedings

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 46th Annual IEEE Custom Integrated Circuits Conference, CICC 2026

Y2 - 19 April 2026 through 23 April 2026

ER -

Li Y, Zhang L, Chen Y, Zhang K, Pan R, Ji J et al. A 108.9dB-DR, 2-2 MASH ADC Featuring a Nested Gainboosting FIA with G_m Enhancement in Settling Phase Through Stepwise Charge Sharing. In 2026 IEEE Custom Integrated Circuits Conference, CICC 2026 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2026. (Proceedings of the Custom Integrated Circuits Conference). doi: 10.1109/CICC65509.2026.11509552