Draft Specification Postamp / Comparator (Discriminator) Version 2.3

Technical Report · Thu Mar 30 04:00:00 EST 1989

DOI:https://doi.org/10.2172/2479782· OSTI ID:2479782

Christian, David Charles ^[1]; Haldeman, Merle ^[1]

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1. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

The purpose of the Postamp / Comparator· P/C) module is to compare the voltage amplitude of the pulses, at the input of this module, to a reference voltage (the threshold voltage) and to latch a logic level output for each pulse greater than that programmable reference voltage. The latching of the logic levels is synchronized with a 53 MHz clock provided by a sequencer module. Differential input signals are received from Silicon Strip Detector (SSD) amplifiers through four64-conductor ribbon cable connectors mounted on the front portion of the P/C module. ECL level output signals are sent via a custom auxiliary. Backplane, to a delay encoder, module located in an adjacent slot in the FASTBUS crate. Eight fast analog sums and eight analog encoded digital sums, intended for use by the prompt trigger logic, are constructed and output through FASTBUS auxiliary cards. These signals also provide a means of debugging a PC module with an oscilloscope without the need of an extender card.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 2479782
• Report Number(s): FERMILAB-TM--2843; oai:inspirehep.net:2852035
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS