Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 41: DAQ, trigger and electronics II

T 41.2: Talk

Tuesday, March 16, 2021, 16:15–16:30, Tp

Towards SLDO characterisation in ITkPixV1 — •Charlotte Perry, Florian Hinterkeuser, Matthias Hamer, Hans Krüger, Fabian Hügging, and Klaus Desch — Physikalisches Institut der Universität Bonn

At the high luminosity upgrade of the LHC at CERN the ATLAS Inner Detector (ID) will be replaced by an all-silicon inner tracker (ITk) consisting of an inner pixel and an outer strip detector. Compared to the current pixel detector, the upgrade will cover a significantly larger phase space while featuring a smaller pixel size.

In order to optimise the material budget, considering the increased current consumption per chip and the significantly higher number of readout chips in the upgraded pixel detector, a serial power scheme of modules had been chosen. In this scheme, a chain of modules is connected in series and supplied with a constant current. The readout chip supply voltage is generated from this constant current by on-chip Shunt-LDO (SLDO) regulators.

The SLDO is an integral part of this kind of powering scheme. It has been extensively tested with several generations of test chips, advancing its design towards the implementation in the first full size readout chip for the upgraded ATLAS pixel detector, the ITkPixV1 readout chip. In this presentation, a first characterisation of the SLDO in the ITkPixV1 is given.