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Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
Today I had a friend in biology science visit with his microscope. I happened to have a uv eeprom laying around, and we took a look. It is simply amazing how small these things are. Under 100x magnification you still can’t individually point out a single transistor or other semiconductor. The video we came up with is below.
We also managed to get a reasonable shot of the materials in a 1n4148 diode. After quite a few wasted ones of course. I think my friend and I may do more of this in the future, coming up with images of the insides of semiconductors. I will put what I have up on my website: electronics324.comoj.com
Also, anyone who wants to see some pretty cool videos of protists and other bio stuff, his channel is lukem1221 on youtube :)
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
Wow, that is really cool. I liked seeing the grid area that I can only imagine is where the info is actually stored. Also, how did you separate the die from the package?
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
it was uv erasable eeprom, so the die was sitting in a hollow chamber with a glass window for exposure. i just took a chisel to cut out the middle. and actually, we got to see it at 400x and see individual "cells", but it was extremely difficult to line up the light source on the microscope. so no images of that :P but because it is 256kb it makes sense that there are a quarter of a million memory latches!
Registered Member #242
Joined: Thu Feb 23 2006, 11:37PM
Location: Erie PA
Posts: 210
This was taken with a cheapo digital camera. No zoom needed. The larger squares are the IGBTs, gate terminal in the center. The smaller squares above it are the recovery/freewheel diodes.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Hi Ben,
standard biological microscope objectives are designed to accommodate the refraction caused by the cover glass on a microscope slide, and cannot be brought to a sharp focus without one, as we see in your pictures.
For higher magnifications, there are designated water and oil immersion objectives, which accommodate the refractive index of these fluids when they are used as a medium between the submerged specimen and the front face of the objective lens.
Ideally, one should use a metallurgical objective for your kind of study, since these are designed to focus directly on the specimen through the air.
You will get better results with a standard biological objective if you bond a microscope cover slip directly to your chip using Canada Balsam, (or a synthetic equivalent) which has the same refractive index as a standard cover slide glass.
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eeprom under 100x magnification
