The RD53B chip for HL-LHC upgrades of ATLAS and CMS pixel detectors needs to provide reliable operation in a radiation hostile environment with inevitable Single Event Effects (SEE). To answer the challenge, substantial efforts are made to protect and evaluate the critical parts of the digital logic and to characterize the on-chip Clock and Data Recovery (CDR) circuit. The SEE sensitivity of the digital logic is evaluated by testing with both heavy-ions and protons. The on-chip CDR is characterized by measuring the SEE-induced phase shifts of its output clocks and their implication on the high-speed link stability.
The Short Strip ASIC (SSA) is one of the four front-end
chips designed for the upgrade of the CMS Outer Tracker for the High
Luminosity LHC. Together with the Macro-Pixel ASIC (MPA) it will
instrument modules containing a strip and a macro-pixel sensor
stacked on top of each other. The SSA provides both full readout of
the strip hit information when triggered, and, together with the
MPA, correlated clusters called stubs from the two sensors for use
by the CMS Level-1 (L1) trigger system. Results from the first
prototype module consisting of a sensor and two SSA chips are
presented. The prototype module has been characterized at the
Fermilab Test Beam Facility using a 120 GeV proton beam.
The Large Hadron Collider (LHC) at CERN will undergo major
upgrades to increase the instantaneous luminosity up to
5–7.5×1034 cm-2s-1. This High Luminosity
upgrade of the LHC (HL-LHC) will deliver a total of
3000–4000 fb-1 of proton-proton collisions at a
center-of-mass energy of 13–14 TeV. To cope with these
challenging environmental conditions, the strip tracker of the CMS
experiment will be upgraded using modules with two closely-spaced
silicon sensors to provide information to include tracking in the
Level-1 trigger selection. This paper describes the performance, in
a test beam experiment, of the first prototype module based on the
final version of the CMS Binary Chip front-end ASIC before and after
the module was irradiated with neutrons. Results demonstrate that
the prototype module satisfies the requirements, providing efficient
tracking information, after being irradiated with a total fluence
comparable to the one expected through the lifetime of the
experiment.
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