Area requirements for cables - Revision 3 (December 2012)
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:
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:
Number of HV lines:
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:
Number of e-links:
TOTAL: 96
Number of module controllers:
Number of HV lines:
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
- 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
TOTAL of part 3: 1026 cables, 2294 mm2
includes powering of the GBT boards and the optical fibers
--
TommasoQuagli - 25 Mar 2013