Transfer functions

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A 0.5–2.5-GS/s Resettable Ring-VCO-Based ADC Eliminating Quantization-Noise Shaping

A 0.5–2.5-GS/s Resettable Ring-VCO-Based ADC Eliminating Quantization-Noise Shaping 150 150
Author(s): Tao Lu, Zixiang Liu, Hao Yang, Sai-Weng Sin, Fujiang Lin, Liheng Lou, Robert Bogdan Staszewski, Yizhe Hu

Abstract:

This article presents a Nyquist-rate Analog-to-digital converter (ADC) operating from 0.5 to 2.5 GS/s based on an open-loop resettable ring VCO (R-RVCO). By inherently embedding the $1 {\,}-{\,}z^{-1}$ transfer function, the R-RVCO eliminates the need for an explicit differentiator, suppresses VCO phase-noise (PN) integration, and avoids quantization-noise (QN) shaping within …

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 15
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3668599
Publisher: IEEE

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A 136.6-dB-DR 174.3-dB-FoMS Versatile Current-to-Digital Converter With a Truncated-Noise-Shaped Baseline-Servo-Loop

A 136.6-dB-DR 174.3-dB-FoMS Versatile Current-to-Digital Converter With a Truncated-Noise-Shaped Baseline-Servo-Loop 150 150
Author(s): Taeryoung Seol, Sehwan Lee, Geunha Kim, Samhwan Kim, Yeonjae Shin, Jeongyoon Wie, Seungyeob Baik, Hongki Kang, Minyoung Song, Jong-Hyeok Yoon, Junghyup Lee

Abstract:

This article presents a high-resolution, wide dynamic-range (DR) current-to-digital converter (IDC) capable of directly digitizing a broad range of bio-current signals. To achieve high resolution, the IDC uses a second-order continuous-time delta–sigma modulator (CT-DSM) architecture with a low-noise current-recycling operational amplifier (op-amp) and a highly linear pseudo-differential voltage-controlled oscillator (…

Published in: IEEE Journal of Solid-State Circuits
Page(s): 1 – 13
Year of Publication: 2026
Electronic ISSN: 1558-173X
DOI: 10.1109/JSSC.2026.3653442
Publisher: IEEE

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