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Description
This paper presents the design and characterization of a readout prototype for Low-Gain Avalanche Diode (LGAD) sensors. Aimed at applications requiring excellent timing resolution, such as particle tracking in future high-energy physics experiments, the prototype addresses the key challenge of processing LGAD signals with fast rise times and moderate gain. The dedicated system integrates two application-specific integrated circuits (ASICs), named LATRIC0 (LGAD Timing Readout Integrated Circuit), on a compact printed circuit board. LATRIC0 is a single channel timing measurement chip that integrates a low-noise, high-bandwidth front-end amplifier, a fast comparator, and a high-precision time-to-digital converter (TDC). LGAD pixels with a size of 2.5 mm*2.5 mm are wire bonded on the board. Initial bench-top testing using a pulsed laser demonstrates that a coincident hit timing resolution of ~25 ps between two LATRIC chips, corresponding to a single LGAD+LATRIC timing resolution of ~17 ps. These results validate a scalable and cost-effective readout architecture and confirm its strong potential for integration into large-area LGAD-based timing detector systems.
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