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How to Include Device Capacitance in Parasitic Extraction?

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cs123456789

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QUESTION:
Do you know a method to get a tabulated list of nodes with total node capacitance including the device capacitance contribution?
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Parasitic extraction generates a node list with associated capacitance.
The reported capacitance is the “parasitic” portion of the total capacitance. It does not include the device capacitance (Cgs, Cgd, etc). The device capacitance is modeled in the analog simulator and therefore taken into account.

QUESTION:
Do you know a method to get a tabulated list of nodes with total node capacitance including the device capacitance contribution?

It is true that if a method is available to include device capacitances, some simplifications and assumptions would be required as the device capacitance changes with operating conditions.

Thanks!
 

Hi, as far as I know, no tool can provide this report.
As you know,the device capacitance changes with operating conditions. So the netlist can't report the node capacitance regardless of the operating points.


if you want to know the total capacitor of one node A, gate of a device,you could check the operating points and see the Cgg.If other devices are connected to A, then calculate sum of them.
Then you can get the total node capcitor of A including the device capacitor.

In addition, if you want to do a post simulation, the netlist extracted from the layout running with the device capacitance(from the layout) and the parasitic capacitor. It's very comprehensive.


Good luck!
 

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