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What do you mean by 2.5D extraction-based RC?

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sameer_dlh25

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I am a frontEnd Guy...
Could sombody explain me what do you mean by 2.5D extraction-based RC?
 

Re: RC Extraction

Well I don't know exactly, but when we talk about dimesions in extraction, it implies how the capacitance will be extracted.

Say when we say a simple extraction, it might just consider overlap caps.
While a 3 D extraction, implies cap extraction in all direction, i.e. overlap caps,
fringing caps, side caps etc...
 
Re: RC Extraction

Hi Truebs,

In that terminology what do you mean by 2.5D ?
Does that mean extraction less than 3D is not accurate ?
:?:
 

RC Extraction

ya compared to 3D extraction 2.5 is extracts less and is less accurate than 3D.
 

RC Extraction

In that terminology what do you mean by 2.5D ?
Does that mean extraction less than 3D is not accurate ?
Click to expand...

There are mainly three levels:
2D extraction
2.5D extraction
3D extraction

Among the above,
2D/2.5D tools do not capture 3D DSM effects.
They are fast (<100,000 nets/hour)
Large errors (>20%) in case of DSM processes

But unlike them, the 3D extraction is very accurate for finer technology nodes.
 

Re: RC Extraction

3D for sure is most accurate as rightly pointed by urslen,

However we do not always go for 3D , it varies from design to design.
3D takes lot of time and produces lot of data for analysis and simulation.
 

RC Extraction

we just consider two interconnect lines (parallel) on metal 1
in 2.5D : when extract, the mutual and self capacitance is proportional with the length because
in 2.5D simulation we think the length is infinitely long and calculate the unit cap. and Res.

so in 2.5D, the accrucy is less than 3D, but higher then 2D
 

RC Extraction

To my knowledge, there is nothing like 2.5D in mathematics.
Let me make it clear:
In 3D extraction the captable contains the capacitance values extracted from all the directions. Eg:fringe capacitance,edge cap,area cap,cross over cap,coupling cap.
In 2D we have only area cap and crossover cap and coupling cap.
But in 2.5D it can have 2D cap values and only few 3D values i.e.., it may miss either edge cap or fringe cap.
that is why 3D is more accurate.
 
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