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Cadence: M1 metal layer capacitance

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jayeshbagada

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to start my design i need to have an idea of parasitic capacitance of the metal and poly tracks.
can anybody suggest me a mathod to calculate it, or some document from CADENCE which specifies Capacitance/\mum for these layers.

Thanks
JB
 

Depends on the process used. See your PDK.
 

erikl it's right, it always depeds on the process. If you have a desing kit you can find out about the parasitics and other tings, but you can always get an aproxiation by hand calculation. Look at the Weste-Eshraghian book (or anyother about circuit design), you can find the calculation for the line wires.
 

For approximate estimate, pls try capacitor equation:C＝ εS/（4πkd）.
S is overlap area, d is gap between Metal and poly layer (it can be found in process document). ε is for oxide.
 

Thanks for reply

I have umc90nm PDK........
just to let you know i wish to find capacitance associated to particular metal line lets say M1.
there is some document in the PDK which gives cap/µm for a metal but i dont know which is that document(not able to locate in my PDK)......so i thought if somebody has used umc PDK before would know abt such document.
 

jayeshbagada said:
Thanks for reply

I have umc90nm PDK........
just to let you know i wish to find capacitance associated to particular metal line lets say M1.
there is some document in the PDK which gives cap/µm for a metal but i dont know which is that document(not able to locate in my PDK)......so i thought if somebody has used umc PDK before would know abt such document.
Click to expand...

hi you can find a section called "electrical parameters & models" in Design Manual, in that section you can find the wiring capacitance & sheet resistance values with these values you can find the actual cap or res value of drawn metal
 

jayeshbagada said:
... I have umc90nm PDK........
i wish to find capacitance associated to particular metal line lets say M1.
Click to expand...

Here you can find comparison cap values for a 90nm process from a different foundry.
 

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