LUCAS: A CMOS-Based Fast Readout ASIC for Silicon Photomultipliers -- Measurement and Performance Evaluation

• DOI: 10.48550/arxiv.2502.02762
• Publication Date: 2025-02-04
• Authors: Seyed Arash Katou...
• Keywords: Silicon Photomultiplier; Application-specific integrated circuit

This paper presents the design, implementation, and performance evaluation of LUCAS, a low-power, ultra-low jitter ASIC optimized for SiPM readout in Time-of-Flight Computed Tomography (ToF-CT) applications. Leveraging novel preamplifier design with low input impedance current-mode operation, LUCAS addresses challenges such as parasitic capacitance SiPMs high-speed detection requirements. The ASIC, fabricated TSMC 65nm CMOS technology, features eight channels an integrated comparator, achieving SPTR 201 ps FWHM at 3.2 mW/ch. Experimental validation includes measurements, testing pulsed laser source, energy-to-Time-over-Threshold calibration using monoenergetic X-ray sources. results demonstrate effectiveness enhancing timing resolution while minimizing power consumption, offering significant advancements high-resolution ToF-CT imaging.