Jun 25 – 29, 2023
Ole-Johan Dahls Hus
Europe/Oslo timezone

P1.16: The SparkPix-S ASIC for the sparsified readout of 1 MHz Frame-Rate X-ray Cameras at LCLS-II: pixel design and simulation results

Jun 26, 2023, 3:01 PM
Ole-Johan Spiseri (Ole-Johan Dahls Hus)

Ole-Johan Spiseri

Ole-Johan Dahls Hus

Ole Johan Dahls Hus - Oslo Science Park Gaustadalléen 23B, 0373 Oslo


Dr Filippo Mele (Politecnico di Milano and Istituto Nazionale di Fisica Nucleare)


Exploiting the “sparse” nature of the information in XPCS and XSVS experiments, we present the SparkPix-S, a 3-sides buttable Application Specific Integrated Circuit (ASIC) based on a sparsified readout strategy for large-format hybrid detectors. The SparkPix-S architecture, based on the successful ePix family, will be composed as follows: a front-end 2-D matrix of 384×352 square pixels with 50 μm pitch is arranged to match the dimensions of a PIN Si-sensor matrix; charge readout, signal shaping and amplitude discrimination is performed at pixel-level, by means of a low-power (<18 μW) analog processor, which, in case of an event, negotiates access to an analog bus placed every other column; on the chip periphery (balcony), the information on each bus is digitized by an array of successive approximation analog-to-digital converters (SAR-ADCs) running at 10 Msps; on the digital back-end the global logic will generate the output data stream using low-voltage differential signalling (LVDS).
A first prototype of the SparkPix-S, with a reduced matrix size of 96×96 pixels, is currently under production on a 130 nm CMOS technology. Simulated performance results show an equivalent noise charge <60 el. r.m.s. at 1 MHz repetition rate, with a maximum input energy of 60 keV and capability to discriminate charge signals with equivalent energy as low as 900 eV.

Primary authors

Lorenzo Rota (SLAC National Accelerator Laboratory) Dr Filippo Mele (Politecnico di Milano and Istituto Nazionale di Fisica Nucleare) Alexandre Habib (SLAC National Accelerator Laboratory) Hyunjoon Kim (SLAC National Accelerator Laboratory) Pietro King (SLAC National Accelerator Laboratory) Bojan Markovic (SLAC National Accelerator Laboratory) Aldo Peña Perez (SLAC National Accelerator Laboratory) Angelo Dragone (SLAC National Accelerator Laboratory)

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