HB LED Pulser Boards

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HB LED Pulser Boards

• By
• Michael Miller
• The University of Iowa

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HB LED Pulser Boards

• HB Pulser board has the same mechanical format as
  the HB QIE Card. Pulser is controlled through the
  CCA (channel control) ASIC via the RBX Serial
  Bus. There are 2 semi independent pulsers on the
  board. Output amplitude is between 1.4 5.2 V.
  LED output light profile is similar to the signal
  from the megatiles. Board provides 5V biasing for
  up to 6 independent PIN diodes. For the pulse
  amplitude the Pedestal DAC outputs are used.
• Vout5.2V N15.3mV
• where N is the 8 bit Pedestal DAC setting. Timing
  for the two LED pulsers is derived from the Test
  Pulse CCA output. This 25 ns signal can be
  masked for channels A and B independently and
  timed to any bunch crossing of the LHC orbit. Two
  external inputs facilitate pulser testing and
  make it possible to work without TTC
  infrastructure.
• There were several minor changes after the first
  prototype 2 extra CCA outputs are used to allow
  individual triggering for Pulser A and Pulser B.
  Maximum output DAC voltage was changed from 2.55V
  to 3.9V to increase the dynamic range of the LED
  signal.

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LED Pulser Board Block Diagram
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Pulser Electrical Diagram
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LED Connection
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HB LED Pulser Board Prototype
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HB LED Pulser Board Prototype output signal
integral profile at different amplitudes
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LED Pulser Board prototype output signal dynamic
range.
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HB LED Pulser Boards Production

• Design, manufacture, quality control and delivery
  done by The University of Iowa.
• 30 LED Pulser Boards delivered to FNAL ASAP, on
  August 2004.
• 110 LED Pulser Boards were tested at the
  University of Iowa and delivered to FNAL in Sept.
  2004.
• The Pulser Boards are o.k. and give enough signal.

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HB LED Pulser Boards Production