pretty much as requested.
From: Craig S Tindall <cstindall@lbl.gov>
Subject: Re: STEIN detector bonding / hybrid board
To: Stephan Boettcher <boettcher@physik.uni-kiel.de>
CC: Wimmer-Schweingruber <wimmer@physik.uni-kiel.de>,
Lars Seimetz <seimetz@physik.uni-kiel.de>,
"Chr. Terasa" <terasa@physik.uni-kiel.de>,
Cesar Martin <martin@physik.uni-kiel.de>,
GEVIN Olivier <olivier.gevin@cea.fr>,
Limousin Olivier <olivier.limousin@cea.fr>,
HUYNH Duc-Dat <duc-dat.huynh@cea.fr>,
Lauri Panitzsch <panitzsch@physik.uni-kiel.de>
Date: Thu, 28 Feb 2013 11:20:09 -0800
With regard to the size of the board opening, I printed out a scale
model of the board to see how it will look and see what the tolerance
is around the edges. Normally I mount the detector by holding with
teflon tweezers on the edges. The tolerances here are quite tight for
this method, so I may have to try using a vacuum pen. The traces are
very close also and I'm a little concerned that the epoxy might flow
out and short them. If it's possible, I would like to request that we
make an opening and metal like the one shown in the drawing that I've
attached. The two tabs will give quite a bit more area to hold the
detector, and I've increased the size of the detector die by 500um in
all directions. The tan area is the metal on the board. The
dimensions are in microns.
It looks as if four of the small pixels are not being used and are
just grounded to one of the traces. Is this correct? Since the
photomasks have not been fabricated yet, I can simply eliminate these
if they are not used. Then they won't need to be wirebonded. Perhaps
I could even extend the die another 500um in three directions to make
the placing and gluing task easier. Is there any reason other than
minimizing the wirebond length that the overlap between the detector
and the board needs to be so small?
I also checked the wirebonding of the ASIC. I'm not sure about the
precise dimensions of the ASIC. I measured roughly 6.56mm x 2.93mm on
an IDEF-BD chip. This appears to leave about 300um of metal all
around the chip. I'm trying to get in touch with the person who does
the wirebonding. I'm not sure that the wirebonding tool is small
enough to allow us to make wirebonds to the metal that extends out
from underneath the chip. That appears to be what is shown in the
"IDEF-X" drawing. Is that correct?
Thanks,
Craig
git-svn-id: svn+ssh://asterix.ieap.uni-kiel.de/home/subversion/stephan/solo/eda@1545 bc5caf13-1734-44f8-af43-603852e9ee25
Subject: Re: STEIN detector bonding / hybrid board
To: Stephan Boettcher <boettcher@physik.uni-kiel.de>
Date: Thu, 28 Feb 2013 11:20:09 -0800
Hello Stephan,
With regard to the size of the board opening, I printed out a scale
model of the board to see how it will look and see what the tolerance
is around the edges. Normally I mount the detector by holding with
teflon tweezers on the edges. The tolerances here are quite tight for
this method, so I may have to try using a vacuum pen. The traces are
very close also and I'm a little concerned that the epoxy might flow
out and short them. If it's possible, I would like to request that we
make an opening and metal like the one shown in the drawing that I've
attached. The two tabs will give quite a bit more area to hold the
detector, and I've increased the size of the detector die by 500um in
all directions. The tan area is the metal on the board. The
dimensions are in microns.
FIRST STEP: T-shaped detector hole, detector dimensions as requested.
TODO: outer copper dimension of the (biased) detector gluing area.
git-svn-id: svn+ssh://asterix.ieap.uni-kiel.de/home/subversion/stephan/solo/eda@1544 bc5caf13-1734-44f8-af43-603852e9ee25
Subject: Re: vias in ept-flex-carriers zum venting ?
To: Stephan Böttcher <boettcher@physik.uni-kiel.de>
Date: Tue, 26 Feb 2013 08:56:19 +0100
Noch eins:
Habe gerade gemerkt, dass mit einem Si-Durchmesser "Flat-Flat" von
14,52 (+0/-0,050) und einem Cutout von 13 (+0/-X (X ==> Was hast du da
"gespect"?) ) ein nomineller Klebespalt von
14,52mm - 13mm = 1,52mm/2 = 0,76 mm entsteht.
Abzüglich Toleranzen sind das dann:
(14,52mm - 0,05mm) - (13mm - X) = 1,47mm /2 - X/2 = 0,74 - X/2
Das ist kleiner als die absolut minimalen 80um Kleberand, die Canberra
uns vorgegeben hat.
Vorschlag: Der Cutout "Flat-Flat" sollte mit 12,8 +0/-0,1 bemaßt
werden. Dann kann die Canberra-Fertigungstoleranz bleiben, Brockstedt
bekommt sein Zehntel Millimeter Toleranz und der Klebespalt bleibt in
jedem Fall zwischen 80 um und 90 um.
Gruß, Lars
outline centerline redrawn at 12.8mm flat-to-flat (was 12.9mm).
Specification in the README updated.
git-svn-id: svn+ssh://asterix.ieap.uni-kiel.de/home/subversion/stephan/solo/eda@1543 bc5caf13-1734-44f8-af43-603852e9ee25
Subject: Re: EPT interconnect detector package assembly scheme
To: Stephan Boettcher <boettcher@physik.uni-kiel.de>
Date: Thu, 28 Feb 2013 11:52:02 +0100
Nur nochmal zur Sicherheit:
Ich, bzw. CANBERRA, sieht z.Zt. ein elektrisch leitfähiges "Gummi" als
Ausgleichring unter dem "electron" detector vor. Das bedeuted nach
meinem Verständnis, dass alle Strukturen (sofern dort welche sind) auf
der Rückseite des Pi-Carriers auf Gehäuse und damit Instrument-Gorund
liegen. ==> Vias auf der Rückseite im Bereich dieses Gummirings ==>
Kurzschluss.
Wenn die Rückseite leer ist, also nur PI ohne vias, o.ä. ist alles ok.
Kannst' das mal bitte prüfen?
GND and signal vias were swapped in y-position.
git-svn-id: svn+ssh://asterix.ieap.uni-kiel.de/home/subversion/stephan/solo/eda@1542 bc5caf13-1734-44f8-af43-603852e9ee25
encode design change:
When L=0 and a nnorm number is send, do not update L.
This is an optimization for very low bitrates.
git-svn-id: svn+ssh://asterix.ieap.uni-kiel.de/home/subversion/stephan/solo/eda@1531 bc5caf13-1734-44f8-af43-603852e9ee25
non-pipelined
left aligned output
testbench moved into source
git-svn-id: svn+ssh://asterix.ieap.uni-kiel.de/home/subversion/stephan/solo/eda@1528 bc5caf13-1734-44f8-af43-603852e9ee25
to match the pinout of the Omentics-25pin connector on
the eptpreamps board.
git-svn-id: svn+ssh://asterix.ieap.uni-kiel.de/home/subversion/stephan/solo/eda@1526 bc5caf13-1734-44f8-af43-603852e9ee25
