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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 Fourth-order ∆Σ Modulator Using Hybrid Noise-shaping SAR ADC with Digital Cancellation
Authors (Sung-Hoon Cho) ; (Myunglae Choo) ; (Byung-Guen Lee)
DOI https://doi.org/10.5573/JSTS.2025.25.5.616
Page pp.616-622
ISSN 1598-1657
Keywords Delta-sigma modulator; noise shaping (NS); successive approximation register (SAR); residue; OpAmp sharing; gm-C integrator
Abstract A hybrid delta-sigma (∆Σ) modulator is proposed to achieve additional second-order noise shaping via feedback paths consisting of the 1-bit fine quantizer output (DFine) and integrated residues. A 5-dB noise suppression is obtained through digital cancellation using DFine without causing noise leakage. In a 180-nm CMOS process with a sampling rate of 12 MHz and oversampling ratios (OSRs) of 16 and 32, the ∆Σ modulator achieved signal-tonoise and distortion ratios (SNDRs) of 92.9 and 96.7 dB and power consumption of 1.3 mW from a 1.8-V supply, showing improved noise suppression and power efficiency.