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Decision feedback equalization for radiation hard data link at 5 Gbps
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Lawrence Berkeley National Laboratory, U.S.A..
Antal upphovsmän: 22017 (Engelska)Ingår i: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 12, artikel-id C01067Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The increased particle collision rate following the upgrade of the Large Hadron Collider (LHC) to an increased luminosity requires an increased readout data speed, especially for the ATLAS pixel detector, located closest to the particle interaction point. For this reason, during the Phase-II upgrade of the ATLAS experiment the output data speed of the pixel front-end chips will be increased from 160 Mbps to 5 Gbps. The increased radiation levels will require a radiation hard data transmission link to be designed to carry this data from the pixel front-end to the off-detector system where it will undergo optical conversion. We propose a receiver utilizing the concept of Decision Feedback Equalization (DFE) to be used in this link, where the number of filter taps can be determined from simulations using S-parameter data from measurements of various customized cable prototypes under characterization as candidates to function as transmission medium between the on-chip data driver and the receiver of the link. A dedicated framework has been set up in Matlab to analyze the S-parameter characteristics for the various cable prototypes and investigate the possibilities for signal recovery and maintained signal integrity using DFE, as well as pre-emphasis and different encoding schemes. The simulation results indicate that DFE could be an excellent choice for expanding the system bandwidth to reach required data speeds with minimal signal distortion.

Ort, förlag, år, upplaga, sidor
2017. Vol. 12, artikel-id C01067
Nyckelord [en]
Analogue electronic circuits, Digital signal processing (DSP), Electronic detector readout concepts (solid-state), Simulation methods and programs
Nationell ämneskategori
Fysik
Forskningsämne
fysik
Identifikatorer
URN: urn:nbn:se:su:diva-141271DOI: 10.1088/1748-0221/12/01/C01067ISI: 000395768300067OAI: oai:DiVA.org:su-141271DiVA, id: diva2:1086971
Konferens
Topical Workshop on Electronics for Particle Physics, Karlsruhe, Germany, September 26-30, 2016
Tillgänglig från: 2017-04-05 Skapad: 2017-04-05 Senast uppdaterad: 2019-11-01Bibliografiskt granskad
Ingår i avhandling
1. Performance Improvements for Particle Tracking Detectors in Extreme Rate and Radiation Environments
Öppna denna publikation i ny flik eller fönster >>Performance Improvements for Particle Tracking Detectors in Extreme Rate and Radiation Environments
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In order to increase its discovery potential, the Large Hadron Collider (LHC) at CERN is being transformed into a higher luminosity machine expected to be operational around 2026. The number of particle collisions will increase by a factor of 10 beyond the current design value, which means that the detectors installed around the LHC are facing various new challenges. The most demanding challenges include handling the enormous data quantities that will be transferred from the front-end readout modules at significantly higher rates than previously, as well as the radiation effects that arise as a consequence of the intense particle flow and that cause damage to sensor elements and electronics.

At the ATLAS experiment, a multipurpose detector operating at the LHC, the impact of the luminosity increase is especially severe for the silicon pixel tracking detector, being the central subsystem located closest to the particle interaction point and therefore exposed to the highest radiation dose and hit density. The extreme radiation doses that the pixel modules will be subject to will cause deformation of the sensor material structure and thus loss of the signals, which after subsequent digitization by the pixel readout chip must be transferred over relatively long distances through a low-mass data link, causing further signal distortion.

The work presented here addresses both major challenges described and outlines solutions for the upcoming upgrade of the ATLAS pixel detector system with regards to these. Firstly, it is demonstrated how improved accuracy of detector simulations and reconstruction of particle trajectories through the detector can be achieved as higher particle fluences are approached, by modeling radiation damage effects that occur in the pixel sensors. Secondly, it is shown how a receiver integrated circuit utilizing an industry standard technique novel within high-energy physics applications has been designed as an integral part of a high-speed transmission link to efficiently restore the signal quality in order to achieve adequate data readout rates.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Physics, Stockholm University, 2019. s. 99
Nationell ämneskategori
Acceleratorfysik och instrumentering
Forskningsämne
fysik
Identifikatorer
urn:nbn:se:su:diva-175161 (URN)978-91-7797-909-8 (ISBN)978-91-7797-910-4 (ISBN)
Disputation
2019-11-29, sal FB54, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2019-11-06 Skapad: 2019-10-15 Senast uppdaterad: 2019-11-01Bibliografiskt granskad

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Totalt: 41 träffar
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