Deltasense
Deltasense introduces a delta-amplification noise-shaping successive-approximation ADC to address the trade-offs between dynamic range (DR), input-referred noise (IRN), and power efficiency in bio-signal monitoring systems. Unlike conventional LNA-based front-ends or ADC-first architectures with DSMs, this approach balances low noise, high linearity, and power efficiency without compromising performance.
Fabricated in a 22nm FDSOI process, it consumes 4.62μW and achieves 91.8dB SNDR with a 1kHz bandwidth, resulting in a Schreier figure of merit (FoMS) of 175.2dB. It achieves a 3.47 NEF and a 12.05 PEF. This novel approach successfully improves bio-signal recording reliability by minimizing artifacts while maintaining ultra-low noise and power efficiency, critical for next-gen biomedical applications.
Design team: Kyeongwon Jeong, Can Livanelioglu, Jiawei Liao and Taekwang Jang, ETH Zürich, with Inhee Lee, University of Pittsburgh
Paper: K. Jeong, C. Livanelioglu, J. Liao, I. Lee and T. Jang, "A 3.47 NEF 175.2dB FOMs Direct Digitization Front-End Featuring Delta Amplification for Enhanced Dynamic Range and Energy Efficiency in Bio-Signal Acquisition," external page 2025 IEEE International Solid-State Circuits Conference (ISSCC), 2025.
DOI: 10.1109/ISSCC49661.2025.10904745. [external page Paper IEEE Xplore]