#Nudging the user
17-Jul-93 10:13:23
Sb: #132029-#Nudging the user
Fm: Peter H. Teeson 72647,3674
To: Rich Parker 76556,1132
Rich:
It's not just wafer size. One has to also consider the number of process steps.
The number of layers in the device also adds considerably. So perhaps a cost
per process step class is a way to get a better grip. For example the chemicals
for etching are indeed 'standard' costed but the number of repetitions is a
function of the number of layers. Similarly with deposition etc.
Then of course one has to factor in the number of wafers per boat. Plus what
about the cost of testing/grading. If it's statistical it's less than if it's
100 %.
Finally packging, plastic versus ceramic etc.
All in all a very complex calculation.
best
Peter