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name="Our_FEI4_wafers" |
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> | The remiaing die on this wafer as of 20th April
From these 46 was glued to a Single Chip Card and tested in Glagsow. However, there was a problem with too much electrically conductive glue causing an electrical short between VDDA2 and GND. Therefore this chip could not be tested.
The likelyhood of demagaed due to the bump deposition and wafer thinning is small. Quated at 4% on numbers collected 4-5 years ago by VTT. So becided to go ahead with flip-chip assembly any how.
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| | After thinnning this wafer suffered damage. The laser scribed ID mark was stuck to the blue tape and could not be released. Upon removal of the wafer from the tape the wafer cracked.
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| | The Wafer test results |
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Pictures of bumps on the wafer from VTT
- 10x -1.jpg: a photo from the chip corner:
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| META FILEATTACHMENT |
attachment="Cu_and_solder_x50.jpg" attr="" comment="Cu and solder x50.jpg: Cu residues after the field metal (Cu) etching." date="1329909349" name="Cu_and_solder_x50.jpg" path="Cu and solder x50.jpg" size="33840" stream="Cu and solder x50.jpg" tmpFilename="/usr/tmp/CGItemp23073" user="RichardBates" version="1" |
| META FILEATTACHMENT |
attachment="Dummy_bumps_x5.jpg" attr="" comment="Dummy bumps x5.jpg: This photo is from the wafer perimeter, where the ROCs are not complete." date="1329909379" name="Dummy_bumps_x5.jpg" path="Dummy bumps x5.jpg" size="83194" stream="Dummy bumps x5.jpg" tmpFilename="/usr/tmp/CGItemp23244" user="RichardBates" version="1" |
| META FILEATTACHMENT |
attachment="ROW-V6ABC1H-cracked-JS-16-Mar-2012.pdf" attr="" comment="" date="1334585216" name="ROW-V6ABC1H-cracked-JS-16-Mar-2012.pdf" path="ROW-V6ABC1H-cracked-JS-16-Mar-2012.pdf" size="501876" stream="ROW-V6ABC1H-cracked-JS-16-Mar-2012.pdf" tmpFilename="/usr/tmp/CGItemp22866" user="RichardBates" version="1" |
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| META FILEATTACHMENT |
attachment="Chips_remaining_18-April-2012.ppt" attr="" comment="Chips remaining as of 18th April 2012" date="1334926588" name="Chips_remaining_18-April-2012.ppt" path="Chips remaining 18-April-2012.ppt" size="799232" stream="Chips remaining 18-April-2012.ppt" tmpFilename="/usr/tmp/CGItemp25177" user="RichardBates" version="1" |
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