Direct-digitization

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A 760 mVPP-Input-Range, 103.6dB-SNDR Direct-Digitization Sensor Readout With Pseudo-Differential Integrator and Impedance-Equalized RDAC

A 760 mVPP-Input-Range, 103.6dB-SNDR Direct-Digitization Sensor Readout With Pseudo-Differential Integrator and Impedance-Equalized RDAC 150 150
Author(s): Kaiwen Zhou, Jianhong Zhou, Yijie Li, Yuying Li, Tian Dong, Zhiliang Hong, Jiawei Xu

Abstract:

A high-precision, direct-digitization sensor readout (DD-RO) based on a continuous-time delta-sigma modulator (CT- $\Delta \Sigma $ M) is presented. The proposed DD-RO incorporates several key innovations to enhance performance. First, a pseudo-differential current-balancing integrator (PD-CBI) significantly extends the linear input range, whereas its intrinsically limited common-mode input range and CMRR are …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 13
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3686843
Publisher: IEEE

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A 3.47 NEF 175.2-dB FoMs Direct Digitization Front-End Featuring Delta Amplification Noise-Shaping SAR ADC for Biosignal Acquisition

A 3.47 NEF 175.2-dB FoMs Direct Digitization Front-End Featuring Delta Amplification Noise-Shaping SAR ADC for Biosignal Acquisition 150 150
Author(s): Kyeongwon Jeong, Can Livanelioglu, Jiawei Liao, Inhee Lee, Taekwang Jang

Abstract:

This article presents a direct-digitization interface for ExG bio-signals’ readout that simultaneously achieves a high dynamic range (DR) and a low noise-efficiency factor (NEF). The proposed delta amplification (DA) and feedback cancellation technique reduce both the input and output ranges of the first amplifier, thus allowing the use of a …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 12
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3685168
Publisher: IEEE

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A Noise-Shaping SAR-Based ExG Sensing Frontend With Dynamic Input-Impedance Boosting and Prediction-Assisted Mismatch-Shaping DEM

A Noise-Shaping SAR-Based ExG Sensing Frontend With Dynamic Input-Impedance Boosting and Prediction-Assisted Mismatch-Shaping DEM 150 150
Author(s): Yiming Han, Linran Zhao, Yaoyao Jia

Abstract:

This article presents a noise-shaping successive approximation register (NS-SAR)-based direct-digitizing electrophysiological (ExG) sensing frontend (SFE) fabricated in a standard 180-nm CMOS process. To address the challenges of large motion artifacts and high electrode–tissue impedance (ETI), we propose three key innovations in our proposed SFE that enable accurate ExG …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 15
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3674986
Publisher: IEEE

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