Readout electronics for lumical first approach
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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

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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


Readout electronics for lumical first approach

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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