january, 2007vaclav vrba, prague fvtx strip sensor design general features: strip pitch = 75 µm #...

January, 2007 Vaclav Vrba, Prague

FVTX Strip Sensor Design General features:

Strip pitch = 75 µm

# chip channels = 128; chip width = 128 x 75 µm = 9600 µm

Forward disk radial coverage (cca) = 17.0 – 4.5 cm = 12.5 cm

# of chips = 12.5 cm/0.960 cm = 13 chips

azimuthal coverage is by 24 wedges; each wedge covers angle of 7.5 º

+ 2 x 1 mm overlap

each wedge consists of two symmetric parts (each covering 3. 75º) + 1 mm overlap

to place on 4” wafer: 2 types of wedges are needed: narrow and wide (next page)

both type wedges we made of the same radial coverage (each 7 “chips”, with 1 chip overlap)

January, 2007 Vaclav Vrba, Prague

Narrow and wide wedges

Two narrow wedges on a wafer One wide wedge on a wafer

January, 2007 Vaclav Vrba, Prague

Narrow and wide wedgesStandard position

Shifted – just to see the radial overlap

The radial overlap is probably too big; may be the “wide” wedge can be (by one “chip”) shorter – please comment

one chip

January, 2007 Vaclav Vrba, Prague

Wedge layoutZoom in …

one chip

testing pads

(both staged)

bonding pads

January, 2007 Vaclav Vrba, Prague

Wedge layout

7.5 deg.

coverage

1 mm overlap

Guard ring

Cut line

January, 2007 Vaclav Vrba, Prague

Wedge layout

January, 2007 Vaclav Vrba, Prague

Conclusions

• See mail