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substrate definition -interface layers

Question asked by MESFET98 on Dec 6, 2003
Latest reply on Dec 8, 2003 by MESFET98
Hello, I am a bit confused ??? , how does momentum define the interface layers in the substrate definition? I though it was as follows:

If I have the following stack up:

Air
-------Strip cond2
Alumina2  Via via2
------- Strip cond1
Alumina1  Via via1
///////GND////////

and I define the thickness as follows:
Alumina1=100um
cond1=10um
Alumina2=100um
cond2=10um

how does momentum define the thickness
of Alumina2 layer? Is it from bottom of cond1 to bottom of cond2, or from top of cond1 to bottom of cond2? I thought it was from top of cond1 to bottom of cond2, but someone told me otherwise. Now I am not sure.

Depending how it is defined, the capacitance calculation will change.

If momentum defines this as from bottom of cond1 to bottom of cond2 then what I specified for alumina2 in this example will be actually 100um-10um=90um between cond1 and cond2.

If it specifies as from top of cond1 to bottom of cond2 then it will be as I specified in the example above.


Any clues?  

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