Forward Calorimeter Baseplane and FC1 Layer Sum Board

D. Tompkins30 June 2015

Rev A Prototype in Hand

TDR testing shows trace impedance very close to 50 Ohms

1 Meter 50 Ohm CoaxPCB Trace

Connector

Data from 5 traces on each of the 7 routing layers:

Layer 1 2 3 4 5 Ave SD2 50.0 50.3 49.7 51.4 50.3 50.3 0.644 50.0 49.2 49.1 50.3 49.5 49.6 0.526 49.9 50.9 49.1 50.6 49.9 50.1 0.708 49.7 49.6 49.8 48.8 49.4 49.5 0.4010 49.2 49.9 49.4 48.7 48.3 49.1 0.6212 49.7 49.0 50.2 49.7 49.5 49.6 0.4314 47.9 48.2 47.5 47.6 47.7 47.8 0.28

Measured Impedance ( Ohms)

Some issues:

• Non-plated through holes are flooded over. • Unused pads removed on all internal layers.

This was done to minimize crosstalk and preserve the ground plane as much as possible.

• Current vertical dimension is at maximum for panel size. Any increase would require moving to the next larger panel size

One major problem

• A new mapping scheme is needed to be compatible with the Back End Readout

New Mapping Scheme• The Back End System requires LTDB0 to handle

all of the FCAL 1 trigger groups

AMCB

LTDB1

LTDB0

LTDB1

AMCFC1

AMCFC2/3

FCal1 FCal2 FCal3 TotalLTDB0Hi-Z 0 0 0 0Lo-Z 192 0 0 192

Outputs 0 0 0 0

FCal1 FCal2 FCal3 TotalLTDB1Hi-Z 0 0 64 64Lo-Z 0 128 0 128

Outputs 0 64 0 64

LTDB0 Mapping

ADC# Pin# E D C B A ADC#47 GND GND GND GND GND46 FC1 GND GND FC1 GND45 FC1 FC1 GND FC1 FC144 FC1 FC1 GND FC1 FC143 FC1 FC1 GND FC1 FC142 GND FC1 GND GND FC141 GND GND GND40 GND39 GND GND GND38 FC1 GND GND FC1 GND37 FC1 FC1 GND FC1 FC1 36353433 FC1 FC1 GND FC1 FC1 32 FC1 FC1 GND FC1 FC1 31 GND FC1 GND GND FC130 FC1 GND GND GND29 FC1 FC1 GND28 FC1 FC1 GND27 FC1 FC1 GND26 GND FC1 GND GND25 GND GND FC1 GND24 GND FC1 FC123 GND GND FC1 FC122 FC1 GND GND FC1 FC121 FC1 FC1 GND GND FC120 FC1 FC1 GND GND19 FC1 FC1 GND18 GND FC1 GND GND17 FC1 GND GND FC1 GND16 FC1 FC1 GND FC1 FC115 FC1 FC1 GND FC1 FC114 FC1 FC1 GND FC1 FC113 GND FC1 GND GND FC1

3338

35

37

40

32

3139

LTDB0JS3

3436

12 GND GND FC1 GND11 GND FC1 FC110 GND GND FC1 FC19 FC1 GND GND FC1 FC18 FC1 FC1 GND GND FC17 FC1 FC1 GND GND6 FC1 FC1 GND5 GND FC1 GND GND4 FC1 GND GND FC1 GND3 FC1 FC1 GND FC1 FC1 2 GND FC1 GND GND FC1 1 GND GND GND GND GND

Pin# E D C B A47 GND GND GND GND GND46 FC1 GND GND FC1 GND45 FC1 FC1 GND FC1 FC1 44 GND FC1 GND GND FC1 43 GND GND GND42 GND41 GND GND40 FC1 GND GND39 FC1 FC1 GND GND38 FC1 FC1 GND FC1 GND37 FC1 FC1 GND FC1 FC1 36353433 GND FC1 GND FC1 FC1 32 GND GND FC1 FC1 31 GND GND FC1 30 GND GND29 GND28 GND GND GND27 GND GND FC1 GND26 GND FC1 FC1 25 GND FC1 FC1 24 GND FC1 FC1 23 GND GND GND FC1

23

28

25

27

2624

21

29

3022

JS2

22 GND GND FC1 GND21 GND FC1 FC1 20 GND FC1 FC1 19 GND FC1 FC1 18 GND GND GND FC1 17 GND GND GND16 GND15 GND GND14 GND GND13 GND GND12 FC1 GND GND11 FC1 FC1 GND10 FC1 FC1 GND GND9 FC1 FC1 GND GND8 GND FC1 GND7 GND GND6 GND5 GND GND GND4 FC1 GND GND FC1 GND3 FC1 FC1 GND FC1 FC1 2 GND FC1 GND GND FC1 1 GND GND GND GND GND

Pin# E D C B A47 GND GND GND GND GND46 FC1 GND GND FC1 GND45 FC1 FC1 GND FC1 FC1 44 GND FC1 GND GND FC1 43 FC1 GND GND GND42 FC1 FC1 GND41 FC1 FC1 GND GND40 FC1 FC1 GND FC1 GND39 GND FC1 GND FC1 FC1 38 GND GND FC1 FC1 37 GND FC1 FC1 36353433 GND GND GND FC1

11

19

1416

15

1713

18

1220JS1

32 FC1 GND GND FC1 GND31 FC1 FC1 GND FC1 FC1 30 FC1 FC1 GND FC1 FC1 29 FC1 FC1 GND FC1 FC1 28 GND FC1 GND GND FC1 27 GND GND GND26 GND25 GND GND24 GND GND23 GND GND22 GND GND21 GND20 GND GND GND19 GND GND GND18 GND17 GND16 GND15 GND GND GND14 GND GND GND13 GND12 GND11 GND10 GND GND GND9 GND GND GND8 GND7 GND GND GND6 GND GND GND5 GND4 GND3 GND2 GND GND GND1 GND GND GND GND GND

75

64

91

10

2

83

Pin# ADC# E D C B A ADC#47 GND GND GND GND GND46 gnd GND GND gnd GND45 gnd GND gnd gnd44 FC2 GND FC2 gnd43 FC2 FC2 GND FC2 FC242 GND FC2 GND GND FC241 Out GND GND Out GND40 Out Out GND Out Out39 GND Out GND GND Out38 FC2 GND GND FC2 GND37 FC2 FC2 GND FC2 FC236353433 gnd FC2 GND gnd FC232 gnd gnd GND gnd gnd31 GND gnd GND GND gnd30 gnd GND GND FC3 GND29 gnd gnd GND FC3 FC328 FC2 gnd GND FC3 FC327 FC2 FC2 GND FC3 FC326 GND FC2 GND GND FC325 Out GND GND gnd GND24 Out Out GND gnd gnd23 GND Out GND FC2 gnd22 FC2 GND GND FC2 FC221 FC2 FC2 GND GND FC220 gnd FC2 GND Out GND19 gnd gnd GND Out Out18 GND gnd GND GND Out17 gnd GND GND FC2 GND16 gnd GND FC2 FC215 FC2 GND gnd FC214 FC2 FC2 GND gnd gnd13 GND FC2 GND GND gnd

JS6

3436

35

37

3338

40

32

3139

LTDB1 12 Out GND GND gnd GND11 Out Out GND gnd gnd10 GND Out GND FC2 gnd9 FC2 GND GND FC2 FC28 FC2 FC2 GND GND FC27 gnd FC2 GND Out GND6 gnd gnd GND Out Out5 GND gnd GND GND Out4 gnd GND GND FC2 GND3 gnd gnd GND FC2 FC22 GND gnd GND GND FC21 GND GND GND GND GND

Pin# E D C B A47 GND GND GND GND GND46 FC2 GND GND gnd GND45 FC2 FC2 GND gnd gnd44 GND FC2 GND GND gnd43 Out GND GND FC3 GND42 Out Out GND FC3 FC341 GND Out GND FC3 FC340 FC2 GND GND FC3 FC339 FC2 FC2 GND GND FC338 gnd FC2 GND gnd GND37 gnd gnd GND gnd gnd36353433 GND gnd GND FC2 gnd32 FC3 GND GND FC2 FC231 FC3 FC3 GND GND FC230 FC3 FC3 GND Out GND29 FC3 FC3 GND Out Out28 GND FC3 GND GND Out27 FC3 GND GND FC2 GND26 FC3 FC3 GND FC2 FC225 FC3 FC3 GND gnd FC224 FC3 FC3 GND gnd gnd23 GND FC3 GND GND gnd

21

29

3022

JS5

28

25

27

2624

23

22 FC3 GND GND gnd GND21 FC3 FC3 GND gnd gnd20 FC3 FC3 GND FC2 gnd19 FC3 FC3 GND FC2 FC218 GND FC3 GND GND FC217 FC3 GND GND Out GND16 FC3 FC3 GND Out Out15 FC3 FC3 GND GND Out14 FC3 FC3 GND FC2 GND13 GND FC3 GND FC2 FC212 gnd GND GND gnd FC211 gnd gnd GND gnd gnd10 FC2 gnd GND GND gnd9 FC2 FC2 GND FC3 GND8 GND FC2 GND FC3 FC37 Out GND GND FC3 FC36 Out Out GND FC3 FC35 GND Out GND GND FC34 FC2 GND GND gnd GND3 FC2 FC2 GND gnd gnd2 GND FC2 GND GND gnd1 GND GND GND GND GND

Pin# E D C B A47 GND GND GND GND GND46 gnd GND GND FC2 GND45 gnd gnd GND FC2 FC244 GND gnd GND GND FC243 gnd GND GND Out GND42 gnd gnd GND Out Out41 FC2 gnd GND GND Out40 FC2 FC2 GND FC2 GND39 GND FC2 GND FC2 FC238 Out GND GND gnd FC237 Out Out GND gnd gnd36353433 GND Out GND GND gnd

19

18

1220

JS4

11

1416

15

1713

32 FC2 GND GND gnd GND31 FC2 FC2 GND gnd gnd30 gnd FC2 GND FC2 gnd29 gnd gnd GND FC2 FC228 GND gnd GND GND FC227 gnd GND GND Out GND26 gnd gnd GND Out Out25 FC2 gnd GND GND Out24 FC2 FC2 GND FC2 GND23 GND FC2 GND FC2 FC222 Out GND GND gnd FC221 Out Out GND gnd gnd20 GND Out GND GND gnd19 FC2 GND GND FC3 GND18 FC2 FC2 GND FC3 FC317 gnd FC2 GND FC3 FC316 gnd gnd GND FC3 FC315 GND gnd GND GND FC314 gnd GND GND gnd GND13 gnd gnd GND gnd gnd12 FC2 gnd GND FC2 gnd11 FC2 FC2 GND FC2 FC210 GND FC2 GND GND FC29 Out GND GND Out GND8 Out Out GND Out Out7 GND Out GND GND Out6 FC2 GND GND FC2 GND5 FC2 FC2 GND FC2 FC24 gnd FC2 GND gnd FC23 gnd gnd GND gnd gnd2 GND gnd GND GND gnd1 GND GND GND GND GND

91

10

2

83

75

64

LTDB1 Mapping

Is this scheme feasible?

• Preliminary routing indicates this scheme will be easier to route than the original.

• The tower driver board connectors don’t need to be swapped.

Layer Sum Board, Rev B

• Redesigned to equalize delay• Now using single stage non-inverting summing

circuits

LSB Block Diagram

Summing Stage