A team led by Daegu Gyeongbuk Institute of Science and Technology (DGIST) professor Lee Jung-hyup has developed an ultra low-power chip that measures biosignals such as electrocardiograms and brain waves at ultra-high resolution, the university said Monday. Measuring biosignals through wearable devices such as a smartwatch requires advanced noise reduction technology, as the signals are extremely weak and easily distorted by user movement. This has increased demand for chips that can suppress noise while supporting a wide input range with low power consumption. To meet those requirements, the team proposed a new noise-shaping successive approximation register analog-to-digital converter (NS-SAR-ADC) architecture, which pushes irregular signal interference caused by external factors into higher frequency regions where it can be removed. Through this architecture, the team achieved advanced low-noise performance that remains stable against variations in voltage and temperature, without relying on complex calibration techniques or large capacitors. The team realized the entire system on a 0