Functional near-infrared spectroscopy (fNIRS) systems are particularly suited for psychiatric studies due to their mobility and flexibility [1]. Frequency-domain (FD) NIRS utilizes multiple source-detector distances (MD) or carrier frequencies (MF) to assess optical properties at varying tissue depths, with both methods yielding comparable results [2]. While MF FD-NIRS is more complex, it is less sensitive to light source-detector coupling variations, enabling more compact systems with fewer optical components. However, most existing work has focused on MD-based approaches [3-5], with limited exploration of MF methods [6]. Current MF FD-NIRS circuits still faces two main challenges (Fig. 1): First, although dynamic architecture has been proposed to decouple resolution from power consumption [4], using the same power across different carrier frequencies still limits energy efficiency. Second, avalanche photodiode's (APD) intensity-phase crosstalk [7] and common offset complicate the accurate determination of metabolite concentrations, leading to diagnostic inaccuracies. Moreover, offset calibration requires additional hardware, increasing system complexity and cost.
- A 0.93 ps-ToF-Resolution 14.6mW NIRS IC with Signal-Aware Optical Frontend and Rotational Modulation Data Converter for Psychiatric Disorders Diagnostics
- Yuxiang Lin - Shanghai Jiao Tong UniversityZhouchen Ma - Shanghai Jiao Tong UniversityZhipeng Guo - Shanghai Jiao Tong UniversityZisheng Dai - Shanghai Jiao Tong UniversityCheng Chen - Shanghai Jiao Tong UniversityYongfu Li - Shanghai Jiao Tong UniversityKea-Tiong Tang - National Tsing Hua University, College of Semiconductor ResearchTianhong Zhang - Shanghai Mental Health CenterGuoxing Wang - Shanghai Jiao Tong UniversityJian Zhao - Shanghai Jiao Tong University
- 2025 IEEE Asian Solid-State Circuits Conference (A-SSCC) (Daejeon, Republic of Korea, 02/11/2025–05/11/2025)
- IEEE
- 3
- Conference paper
- 02/11/2025
- 2025 IEEE Asian Solid-State Circuits Conference (A-SSCC), pp.256-258
- English