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The Journal of Semiconductor Technology and Science (JSTS) is an international, peer-reviewed, and open-access journal that is published bimonthly.
- Scope: semiconductor processes, devices, circuits, and MEMS.
- Editor-in-Chief: Prof. Woo Young Choi (ECE, Seoul National University)
- Indexed within Science Citation Index Expanded (SCIE), SCOPUS, Korea Citation Index (KCI), and other databases.

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Title A Second-order 8.3-MHz BW Noise-shaping SAR ADC Using Shared Amplifier for Lossless Switched-capacitor Integration
Authors (Young-Hwan Lee) ; (Jae-Geun Lim) ; (Hyung-Jung Kim) ; (Jae-Hyuk Lee) ; (Seong-Bo Park) ; (Seong-U Choi) ; (Joo-Yeol Yang) ; (Jun-Ho Boo) ; (Gil-Cho Ahn)
DOI https://doi.org/10.5573/JSTS.2025.25.5.576
Page pp.576-584
ISSN 1598-1657
Keywords Analog-to-digital converter (ADC); noise-shaping successive approximation register (NS-SAR); noise; transfer function (NTF); lossless integration; a ping-pong switched-capacitor (SC)
Abstract This paper presents an 8.3-MHz second-order noise-shaping successive approximation register (NS-SAR) analog-to-digital converter (ADC). To achieve an ideal second-order noise transfer function (NTF), an integrator combining an amplifier with a ping-pong switched-capacitor (SC) is used. By sharing the amplifier between two integrators, the design reduces the area of the loop filter. Implemented in a 28 nm CMOS process, the prototype achieves a bandwidth of 8.3 MHz while operating at a 100 MHz with an oversampling ratio (OSR) of 6. It achieves a signal-to-noise and distortion ratio (SNDR) of 66.1 dB, and a dynamic range (DR) of 69.8 dB while consuming 2.93 mW from a 1 V supply. The resulting Schreier figure-of-merit (FoMS) is 160.6 dB, and the Walden FoM (FoMW) is 107.0 fJ/conversion-step. The active die area occupies 0.101 mm2 .