Reliability and performance studies of DC-DC conversion powering scheme for the CMS pixel tracker at SLHC

A. Todri, L. Perera, R. Rivera, S. Kwan

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)


The upgrades of the Large Hadron Collider (LHC) introduce a significant challenge to the power distribution of the detectors. DC-DC conversion is the preferred powering scheme proposed to be integrated for the CMS tracker to deliver high input voltage levels and performing a step-down conversion nearby the detector modules. In this work, we propose a step-up/step-down powering scheme by performing voltage step up at the CAEN supply unit and voltage step down near the detector. We designed step-up converters and investigate the pixel performance and power loss on the FPIX power distribution system. Tests are performed using the PSI46 pixel readout chips on a forward pixel panel module and the DC-DC converters developed at CERN and Fermilab. Reliability studies include the voltage drop measurements on the readout chips and the power supply noise generated from the converter. Performance studies include pixel noise and threshold dispersion results. Comparison between step-down only and step-up/step-down conversion powering schemes are provided.

Original languageEnglish
Article numberC12010
Number of pages9
JournalJournal of Instrumentation
Issue number12
Publication statusPublished - Dec 2010
Externally publishedYes


  • Detector design and construction technologies and materials
  • Digital electronic circuits
  • Voltage distributions


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