Question

1. Integrated circuits that you might find in your cell phone are probably fabricated from  _______________, a column IV material with dopants from Column III  (List Two elements)  ___________ and _____________, and dopants from Column V (List Two elements)__________________ and ___________________.  Note there is a periodic table in the upper left hand corner of our class room.

2. Your back lighting for your laptop, if accomplished using LEDs, is an example of a photonic device and  is   fabricated from elements in Columns _____ and _____ of the periodic table and one example from each column  would be the element (Column  III)  ___________ and  (Column V) ___________.
3. Assuming you don’t lose your NAND flash thumb drive,  you can expect it to last for about  (One day after the warranty period ends,  a few hundred cycles of READ-WRITE operation,  a few thousand cycles of READ-WRITE operation, almost forever)  Circle your choice.
4. NAND flash is an example of a (VOLATILE, NON-VOLATILE) memory while DRAM is an example of  (VOLATILE, NON-VOLATILE) memory.
5. A standard  older technology DVD can store about a  two-hour movie and supplemental trailers and material while a Blu-Ray^TMcan easily store eight+  hours of video material using the same video formats.   Briefly, but  quantitatively, explain this increased data density in terms of the LASER wavelengths being used.
6. A reasonably current transistor minimum feature size is about 45 nm.  How many of these transistors could you line up across the diameter of a human hair?
7. As a follow-up from the previous question, the next technology node for production is about 22 nm.  The consequences of this feature size reduction means:

1. The device density  (INCREASES TWO TIMES, DECREASES 4 TIMES, INCREASES  times, INCREASES FOUR TIMES).  Circle your choice.
2. The leakage current between devices ( INCREASES, DECREASES, REMAINS ABOUT THE SAME). Circle your choice.
3. The manufacturing yield probably ( INCREASES, DECREASES, REMAINS ABOUT THE SAME). Circle your choice.
4. The ability to distinguish between a ONE and a ZERO probably ( INCREASES, DECREASES, REMAINS ABOUT THE SAME). Circle your choice.
5. The chip thermal heating probably  ( INCREASES, DECREASES, REMAINS ABOUT THE SAME). Circle your choice.

Answer 1

a) Integrated circuits that you might find in your cell phone are probably fabricated from  Silicon, a column IV material with dopants from Column III  (List Two elements)  Gallium and Indium, and dopants from Column V (List Two elements) Antimony and Arsenic.

b) Your back lighting for your laptop, if accomplished using LEDs, is an example of a photonic device and  is   fabricated from elements in Columns III and V of the periodic table and one example from each column  would be the element (Column  III)  Gallium and  (Column V) Arsenic.

c) Assuming you don’t lose your NAND flash thumb drive,  you can expect it to last for about (a few thousand cycles of READ-WRITE operation)

d) NAND flash is an example of a (NON-VOLATILE) memory while DRAM is an example of  (VOLATILE) memory.

e) A standard  older technology DVD can store about a  two-hour movie and supplemental trailers and material while a Blu-Ray^TMcan easily store eight+  hours of video material using the same video formats.   Briefly, but  quantitatively, explain this increased data density in terms of the LASER wavelengths being used.

DVD used red laser but Blu Ray uses blue/violet laser. The blue laser used in Blu Ray allows data to be stored in greater density compared to the red laser of DVDs

f) A reasonably current transistor minimum feature size is about 45 nm.  How many of these transistors could you line up across the diameter of a human hair?

Average diameter of human hair is in the range of 17 - 181 micrometers = 17,000 - 181,000 nm.

This means approximately 378 to 4022 reasonably current transistorscould be lined up across the diameter of a human hair.

g) As a follow-up from the previous question, the next technology node for production is about 22 nm.  The consequences of this feature size reduction means:

• The device density (INCREASES FOUR TIMES).
• The leakage current between devices (DECREASES)
• The manufacturing yield probably (INCREASES)
• The ability to distinguish between a ONE and a ZERO probably (INCREASES)
• The chip thermal heating probably (INCREASES)