arXiv subjects

Seyed Arash Katourani

Publications and source records attributed to Seyed Arash Katourani.

2 recordsLinked to original sources

arXiv2025

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

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

eess.SP↗

arXiv2025

LUCAS: A Low-Power Ultra-Low Jitter Compact ASIC for SiPM Targetting ToF-CT

We present LUCAS (Low power Ultra-low jitter Compact ASIC for SiPM), an analog front-end for Silicon Photomultipliers (SiPM) targeting fast timing detectors in Time-of-Flight Computed Tomography (ToF-CT). LUCAS features a very low input impedance preamplifier followed by a voltage comparator. It is designed in TSMC 65 nm low-power CMOS technology with a power supply of 1.2 V. Our first 8-channel prototype has been sent to fabrication and will be received in August 2023. Post-layout simulations predict less than 40 ps FWHM SPTR jitter and an approximate power consumption of 3.2 mW per channel. The front end is suitable for applications with rigorous jitter requirements and high event rates, thanks to its 3.9 GHz unity-gain bandwidth. The front-end compact form factor will facilitate its incorporation into systems demanding high channel densities.

physics.ins-det↗