Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen...
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Transcript of Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen...
![Page 1: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/1.jpg)
Status of Indium Bumped FE-I4BRichard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen28/03/2014
![Page 2: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/2.jpg)
Introduction• 300μm CPII sensor Indium bump
bonded to FE-I4B ROC
• Set up on probe station in GLADD to readout using USBPix
• RX Delay and Analog and Digital scans done to test module was working
• Tuning performed on the module to ascertain number of disconnected/merged bumps and dead pixels
RX Delay
Analog
Digital
![Page 3: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/3.jpg)
Disconnected pixels• Disconnected pixels• (criteria: Sigma > 0e and < 200e)
• This is the case for 6 out of 26880 pixels
![Page 4: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/4.jpg)
Merged Bumps• Merged pixels• (criteria: Crosstalk occurs at 100V)
• This is the case for 106 out of 26880 pixels
![Page 5: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/5.jpg)
Dead Pixels• As tuning was not ideal, this is
an approximate value by counting pixels with sigma value less than 1e from Threshold Scan @ 100V from long tuning attempt (see later)
• 21 pixels dead
![Page 6: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/6.jpg)
Bump Yield• DISCONNECTED: 6 • MERGED: 106• DEAD: 21
• TOTAL: 133 out of 26880
• BUMP-YIELD: 99.505%
![Page 7: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/7.jpg)
Tuning• The IBL tuning scheme
did not work fully as it uses FAST tunes and all parameter space was not scanned• 3000e threshold with
9ToT @ 16ke
• THRESHOLD: Slightly high compared to target. White pixels here are not dead pixels, but pixels which are not ‘reached’ using a fast tuning.
![Page 8: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/8.jpg)
Tuning• Compared to SC-3072-4-8
(250μm x 50μm)
• THRESHOLD: 2975e
![Page 9: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/9.jpg)
Tuning• Sigma on threshold with 0V
bias shows very few pixels with values around 120e (disconnected)
• Next slide has log Y plot to show pixels with low values of sigma
![Page 10: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/10.jpg)
Tuning• Log Y Scale on sigma plot
![Page 11: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/11.jpg)
Tuning• Compared to SC-3072-4-8
(250μm x 50μm) at 100V
• SIGMA: 119.6e
![Page 12: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/12.jpg)
Tuning• TOT: This looks good!
![Page 13: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/13.jpg)
Tuning• Compared to SC-3072-4-8
(250μm x 50μm)
• TOT: 8.99
![Page 14: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/14.jpg)
Tuning• LONG tuning at 100V looked
to be problematic:• Threshold very high
• although note the pixels which were white in fast tune are occupied now
• Sigma very spread out
• Closer look at individual SCurves of pixels showed very poor fit giving both:• HIGH THRESHOLD!• LARGE SIGMA! HIGH THRESHOLD!
SCurve is evident – fit has failed
![Page 15: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/15.jpg)
Tuning• LONG tuning at 100V looked
to be problematic:• Threshold very high• Sigma very spread out
• Closer look at individual SCurves of pixels showed very poor fit giving both:• HIGH THRESHOLD!• LARGE SIGMA!
LARGE SIGMA!Poor fit – sigma actually much smaller!
![Page 16: Status of Indium Bumped FE-I4B Richard Bates, Craig Buttar, Kate Doonan, John Lipp, Thomas McMullen 28/03/2014.](https://reader036.fdocuments.net/reader036/viewer/2022062511/5518a1cd550346a61f8b48d6/html5/thumbnails/16.jpg)
Tuning• I am contacting Malte Beckhaus at CERN to see if there is a
method of improving the fit for the SCurves • With this issue, the threshold value and sigma value for each
pixel is wrong in this case