— test board for cbm01b2 baby detectors —
DESCRIPTION
Microstrip detector testing at GSI. — Test board for CBM01B2 baby detectors —. Anton Lymanets & Johann Heuser. CBM collaboration meeting GSI, 27 February 2008. Detector CBM01B2. 256 256 orthogonal strips; 50.7 µm pitch; AC readout; 285 µm thick Dimensions: - PowerPoint PPT PresentationTRANSCRIPT
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— Test board for CBM01B2 baby detectors —
Anton Lymanets & Johann Heuser
CBM collaboration meeting
GSI, 27 February 2008
Microstrip detector testing at GSI
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Detector CBM01B2
256 256
orthogonal strips;
50.7 µm pitch;
AC readout;
285 µm thick
Dimensions:
1.56 1.56 cm2
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test global detector characteristics
e.g. IV, CV
access both detector sides
contact a few strips for detailed measurements, including n-XYTER readout
do all this as quickly and as simple as possible
Let’s make a test board
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Read-out CBM01B2 sensor (“small baby”, 50.7 μm pitch)
Read-out 32 strips in the middle of sensor on both sides
Ultrasonic wedge bonding PCB → sensor
Ordinary line density
Two test zones 1 cm2 each for adjustment of bonding head
Standard ERNI 114805 connector to n-XYTER kit
Test board
PCB: • Standard manufacturing limits • in particular the pitch size of the bonding pads: 200 µm line pitch
Wire bonding: • Max. recommended bond wire
length @ 50 µm pitch: ~ 2.5 mm
• Fan-out bond pattern required.
Max. opening angle: ~ 40 deg
Advice from:
H. Deppe (bonding, PCB)R. Lalik (connection to n-XYTER board)
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PCB top side PCB bottom side
100 mm
70 mm
70 m
m
100
mm
pad 10 x 10 mm2
copper with chemical gold
opening for detectorlegs bias pads
SMD 1 M, 4 x total
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15.6 mm
"balcony"
15.6
mm
15.0
mm
15.0 mm
1.6 mm
15.6 mm
PCB
bond wire
"balcony"
PCBglue
0.3 mm
detector
0.6
mm
1.0
mm
Opening in PCB for detector mounting
Top view
Side view
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4 bias pads
Connector:ERNI model 114805 Dual row, male, type BPins: 68 (unused pins marked red) Height: 8.2 mmSize: ~(6.3×46.3) mm2
Pin pitch: 1.27 mm (both x and y)
Four 1MΩ resistors
http://www.erni.com/smc.htd?gID=4654590
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PCB to Si sensor bonding
Pads layout at PCB:Line width: 100 μm 2
(no pads)Pitch: 200 μm
PCB
CBM01B2
Max angle: 51°Max bond length: 3.3 mm
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Mechanical mounting of the detector
"balcony"
~ 1.6 mm
~ 1.5 cm
~ 300 µm
"balcony"
PCB PCBglue
bond wire
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PCB Layout
Layout made by
P. Skott
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Metal support structure to support PCB and sensor during bonding
100
12 50
120
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Conclusions & work plan
Design finished, Layout finished
Production @ ILFA, Hannover: ongoing
(incl. gold plating, machining of hole) Weeks 8, 9, 10 2008
Al bonding fixture: to be manufactured
Setup of testing station in C27 (Power supply, etc.)