The CLEO-III Trigger: Analog and digital calorimetry

G. D. Gollin, J. A. Ernst, J. B. Williams, M. J. Haney

Research output: Contribution to journalConference articlepeer-review


The calorimetry subsystem of the CLEO-III Trigger incorporates both analog and digital electronics to provide pipelined trigger information every 42 ns with a latency of approximately 2.5 μs. This paper describes the pipelined signal-processing and pattern-recognition schemes used to provide calorimeter information to the experiment trigger, with somewhat greater emphasis on the analog components of the system. Analog processing is employed to address the quantization error caused by split energy deposition in adjacent calorimeter cells, and digital field programmable gate arrays are used extensively to filter and categorize the calorimeter energy topology. Timing, geographical, and energy information are all available for use in the calorimeter trigger.

Original languageEnglish (US)
Pages (from-to)547-551
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number3 I
StatePublished - Jun 2001
Event2000 Nuclear Science Symphosium (NSS) - Lyon, France
Duration: Oct 15 2000Oct 20 2000


  • Analog processing circuits
  • Calorimetry
  • Digital circuits
  • Field-programmable gate arrays (FPGAs)
  • Trigger circuits

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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