Area requirements for cables - Revision 3 (December 2012)

(Older revisions)

Detector Requirements

Pixel part

Number of supermodules: 66

Number of sensors:

• 34 (2 chips size)
• 28 (4 chips size)
• 54 (5 chips size)
• 60 (6 chips size)

TOTAL: 176

Number of HV lines:

• 1 per sensor --> 176

Number of front-end chips:

• 338 (barrels)
• 472 (chips)

TOTAL: 810

Number of DC-DC converters: 596

Strip part

Powering schemes:

The following powering schemes were assumed for the routing calculations:

• Barrel Powering scheme:
  
• Disk Powering scheme:
  

Barrel layout

The following strip barrel layout is used:

Number of staves:

• 16 (A-type)
• 4 (B-type)
• 22 (C-type)
• 4 (D-type)

TOTAL: 46

Number of front-­ends:

• 1176 (128 channels)
• 184 (64 channels)

TOTAL: 1360

Number of sensors:

• 184 (rectangular), each requiring 5x 128ch. FEs and 1x 64ch. FE
• 64 (squared), each requiring 4x 128ch. FEs

TOTAL: 248

Number of module controllers:

• 1 per sensor --> 248

Number of HV lines:

• 1 per sensor --> 248

Number of DC-DC converters: 5 per sensor

• n-side FEs (analog and digital)
• p-side FEs (analog and digital)
• MDC

TOTAL: 1240

Number of e-links:

• each "red" sensor: 2 e-links --> 46x2 = 92 e-links
• each "blue" sensor: 1 e-link --> 202 e-links

TOTAL: 294

e-links per stave

• A-type: 6 e-links
• B-type: 5 e-links
• C-type: 7 e-links
• D-type: 6 e-links

Number of data lines:

• 3 differential (= 6 single-ended) per e-link
• 16 single-ended lines per stave

• A-type: 6x6 + 16 = 52 single-ended lines
• B-type: 5x6 + 16 = 46 single-ended lines
• C-type: 7x6 + 16 = 58 single-ended lines
• D-type: 6x6 + 16 = 52 single-ended lines

Number of GBT boards:

• 8 e-links per board --> 294/8 = 37 boards

Disk layout

There are 24 identical supermodules, each consisting of 2 sensors.

Number of sensors:

• 48 (trapezoidal), each requiring 8x 128ch. FEs

Number of front-­ends:

• 384 (128 channels)

Number of e-links:

• each sensor: 2 e-links

TOTAL: 96

Number of module controllers:

• 1 per sensor --> 48

Number of HV lines:

• 1 per sensor --> 48

Number of DC-DC converters: 5 per sensor

• n-side FEs (analog and digital)
• p-side FEs (analog and digital)
• MDC

TOTAL: 240

Number of GBT boards:

• 8 e-links per board --> 96/8 = 12 boards

Number of data lines:

• 3 differential (= 6 single-ended) per e-link
• 16 single-ended lines per stave

• per supermodule (2 sensors): 4x6 + 16 = 40 single-ended lines

Cable occupancy

Detailed calculations are available in the table and are summarized in the slides. For further details please contact TommasoQuagli. A short summary follows.

The cables are divided in three categories:

• from the outside to the MVD (through the GBT area) - 1
  • powering of the chips (analog and digital) for strips (FE) and pixels (Topix)
  • powering of the MDCs
  • biasing of the sensors for pixels and strips
• from the GBT boards to the MVD - 2
  • flat data cables
• from the outside to the GBT boards - 3
  • powering of the GBTs
  • optical fibers

1: supply cables

Input parameters for the calculation:

• power consumption:
  • MDC: 0.25 A @ 2.5 V = 625 mW
  • FE analog: 0.55 A @ 1.2 V = 660 mW
  • FE digital: 0.3 A @ 1.2 V = 360 mW
  • Topix analog: 0.2 A @ 1.2 V = 240 mW
  • Topix digital: 1.2 A @ 1.2 V = 1440 mW
• cable length: 4 m
• maximum allowed voltage drop: 100 mV
• material:
  • inside MVD area (cables of the disks): Al/Cu (ρ=2.65·10^‐8 Ω·m)
  • outside MVD area (cables of the barrels): Cu (ρ=1.68·10^‐8 Ω·m)
  • plastic cladding: 1mm in diameter

Formula for diameter:

• Disks (Al/Cu):
  • Pixels: 1008 cables, 4970 mm²
  • Strips: 576 cables, 2752 mm²
    • TOTAL: 1584 cables, 7722 mm²
• Barrels (Cu):
  • Pixels: 616 cables, 2589 mm²
  • Strips: 2976 cables, 9375 mm²
    • TOTAL: 3592 cables, 11964 mm²

TOTAL of part 1: 5176 cables, 19686 mm²

includes powering of the front-ends (analog and digital), of the MDCs and biasing of the sensors

2: flat data cables

Cable parameters:

• 18 differential pairs
• cross section 210 µm · 14 mm
• large safety factor included

• Pixels:
  • Barrels: 122 cables, 427 mm²
  • Disks: 196 cables, 686 mm²
• Strips:
  • Barrels: 48 cables, 168 mm²
  • Disks: 248 cables, 868 mm²

TOTAL of part 2: 614 cables, 2149 mm²

3: GBT cables

Input parameters for the calculation:

• power consumption:
  • GBT 2.5: 0.943 A @ 2.5 V = 2358 mW
  • GBT 1.5: 0.425 A @ 1.5 V = 638 mW
• cable length: 3 m
• maximum allowed voltage drop: 100 mV
• material:
  • Cu (ρ=1.68·10^‐8 Ω·m)
  • plastic cladding: 1mm in diameter
• number of GBT boards:
  • Pixel barrels: 34
  • Pixel disks: 88  
  • Strip barrels: 37
  • Strip disks: 12

Formula for diameter:

• Pixels: 488 cables, 1392 mm²
• Strips: 196 cables, 560 mm²

Optical fibers parameters:

• 2 optical fibers per GBT board
• cross section 1 mm²

• 342 fibers, 342 mm²

TOTAL of part 3: 1026 cables, 2294 mm²

includes powering of the GBT boards and the optical fibers

-- TommasoQuagli - 25 Mar 2013