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Readout electronics for LumiCal – first approach. Wojciech Wierba Witold Daniluk Krzysztof Oliwa. Topics. Mechanical design Space for electronics Pads & strips designs Readout based on analog transmission Digital data transmission Readouts based on digital transmission.

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readout electronics for lumical first approach

Readout electronics for LumiCal – first approach

Wojciech Wierba

Witold Daniluk

Krzysztof Oliwa

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

topics
Topics
  • Mechanical design
  • Space for electronics
  • Pads & strips designs
  • Readout based on analog transmission
  • Digital data transmission
  • Readouts based on digital transmission

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

slide3

Mechanical design of LumiCal

  • Segmented silicon sensors interspersed into the tungsten half disks
  • Two half barrels to allow for mounting on closed beam pipe
  • The blue bolts support the heavy part of the detector, tungsten half disks
  • The red bolts carry only the sensors
  • Holes for precision survey the sensors position

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

space for electronics
Space for electronics
  • There is a limited space for the FE electronics for the 300 mm radius of LumiCal
  • Bolts for tungsten & sensors support takes additional space
  • Si sensors online positioning needs place also

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

pads strips design
Pads & Strips Design

Strips

Pads

  • Both designs becomes very similar
  • Different number of electronic channels: Strips ~8000, Pads ~25000

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

possible readout designs
Possible readout designs
  • Analog transmission – simple, low heat dissipation, easy to maintenance – a huge number of cables, crosstalk, noise
  • Digital transmission – small number of digital links, no crosstalk on the transmission – complicated, high heat dissipation

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

analog transmission
Analog transmission
  • 25000 analog cables (coaxial or TP) needs ~30 mm round the LumiCal

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

digital transmission lvds link
Digital Transmission LVDS link
  • Current speed – 0.6 Gb/s
  • Up to 10 m

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

number of lvds links for lumical
Number of LVDS links for LumiCal
  • 5000 bunches i one train – 1 ms
  • Break between trains – 300 ms
  • Number of channels – 25000
  • 10 bit ADC
  • Amount of data per train – 1.25 Gb
  • Transmission during train – 1.25 Tb/s - ~2000 links
  • Transmission during break – 3.75 Gb/s - ~6 links

>>

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

parallel conversion
Parallel conversion
  • ADC in each channel – expensive and space on chip consuming

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

multiplexed adc
Multiplexed ADC
  • One ADC for a group of channels – cheaper, needs S/H and MUX

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

analog pipelined
Analog pipelined

Analog pipeline with ~5000 cells and 10 (12) bits accuracy over 300 ms is not a easy project, but the number of ADC can be reduced by a factor of 300

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

conclusions
Conclusions
  • Number of channels is essential to chose the readout solution
  • Digital data transmitted over the break between trains
  • Analog pipeline or MUX can reduce a number of ADC’s
  • This talk seems to be a background for the discussion

FCAL Collaboration Meeting

INP PAN, Kraków, Poland

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