Results from End-of-Substructure card production for the ATLAS ITk Strip upgrade using both the lpGBT-v1 and -v2 ASIC

Bauckhage, Lukas; Ceslik, Harald; Arranca Menezes Trigueiros da Silva, André Filipe; Gregor, Ingrid-Maria; Melepatte, Praveena; Gotfredsen; dam; Ruiz Daza, Sara; Stroem, Lars Rickard; Boebel, Artur; Palmelund; Garvey, Cameron Michael; Diez Cornell, Sergio; Göttlicher, Peter; Keaveney, James Michael; Schmitt, Stefan; Stanitzki, Marcel

Poster

PUBDB-2025-04723

Results from End-of-Substructure card production for the ATLAS ITk Strip upgrade using both the lpGBT-v1 and -v2 ASIC

Bauckhage, L.DESY* ; Boebel, A.DESY* ; Ceslik, H.DESY* ; dam ; Arranca Menezes Trigueiros da Silva, A. F.DESY* ; Diez Cornell, S.DESY* ; Garvey, C. M.Extern* ; Gotfredsen ; Göttlicher, P. (Corresponding author)DESY* ; Gregor, I.-M.DESY* ; Keaveney, J. M.Extern* ; Melepatte, P.DESY* ; Palmelund ; Ruiz Daza, S.DESY* ; Schmitt, S.DESY* ; Stanitzki, M.DESY* ; Stroem, L. R.DESY*

2025

Topical Workshop on Electronics for Particle Physics, TWEPP, Rethymno, Greece, 6 Oct 2025 - 10 Oct 2025

Abstract: The tracking systemof the ATLAS experiment will be upgraded for the upcoming High-LuminosityUpgrade of the LHC (HL-LHC). The main building blocks of the new strip tracker are silicon-stripmodules that consist of a sensor and hybrid PCB’s. The modules are mounted on rigid carbon-fibresubstructures, known as staves in the central barrel region and petals in the end-cap regions, thatprovide common services to the modules. At the end of each stave or petal side, a so-called Endof-Substructure (EoS) card facilitates the transfer of data, power, and control signals between themodules and the off-detector systems. The EoS connects up to 28 data lines, each with 640Mb/s,from the modules to one or two lpGBT chips that provide data serialization and use a 10Gb/sversatile optical link (VL+) to transmit signals to the off-detector systems. The lpGBT also recoversthe LHC clock on the downlink and generates clock and control signals for the modules. To meetthe tight integration requirements in the detector, fourteen different EoS card designs are necessary.The power to the EoS is provided by a dedicated dual-stage DC-DC package providing 2.5 and1.26V to the EoS cards. A first production of almost 2000 EoS cards has been stopped due to theerrors found in the lpGBT-v1 ASIC, but all accompanying DC-DC converters have been produced.We report on the production experience including detailed QC statistics and design validation (QA)results for the EoS itself with the lpGBT-v1 ASIC and how the two lpGBT issues were identifiedand how many EoS boards were affected by each. With the lpGBT-v2 ASIC now in hand, we reportfirst QC results with the second production iteration.

Note: I entered it no to have it here, Proceeding are submitted, if accepted, then that will be likely for 2026.

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