Beetle - a readout chip for LHCb
 

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Beetle 1.3

Beetle 1.3 is the first of the three versions, submitted on the final Beetle engineering run in May 2004.
Detailed informations about the operation of Beetle 1.3 can be found in the User Manual.

Chip pad layout of the Beetle 1.3

Layout of the Beetle 1.3 chip Padlayout of the Beetle 1.3 chip

Beetle 1.3 pad-description specifies all Beetle pads, positions and pad types.

Quick summary of improvements on Beetle 1.3

  • resize chip dimension to 5.4mm x 6.1mm
  • modifications in comparator design, 5 bit channel resolution
  • power:
    • new power pads at analogoue input
    • power routing changed in front-end (esp. shaper), power blocking
    • pipeamp power routing (already done on Beetle12MA0)
    • merged pad openings of adjacent power pads
    • separation of digital multiplexer power and digital core power
    • separation of power comparator core <-> comparator LVDS pads
    • 2 new power pads for digital core (located on bottom side, between power pads of comparator core / LVDS pads
  • moved all current mirrors in front-end from top-side to bottom side
  • new current output driver (inc. gain)
  • fixed overvoltage problem
  • 5V tolerant I2C pads
  • reduced number of FF in multiplexer
  • removed switching spikes in readout header
  • fixed crosstalk from readout header into first readout channel
  • fixed sticky charge problem
  • fixed baseline problem in consecutive readouts (run away of baseline)
  • changed testpulse pattern
  • new probe for current DAC measurements
  • fixed daisy chain bug (problem with RoReTokenIn-pad)
  • fixed limitation Rclk divider ratio
  • reduced number of clock buffers in Beetle core
  • ...
   
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Letzte Änderung: 18 Jun 2004