Contact Resistance Calculation

[dream_taker]

sheet contact resistance calculation

Can anyone tell me how to find the contact resistance for a process. If I draw a huge transistor of w/l with m=x fingers, then how to go abt it.

Tks

 

[sgperzoid]

you can find it in process techfile

good luck

 

[yibinhsieh]

I think yuo can find in founday design manual. Usually it is in the order of 5~10 ohms per contact.

Yibin.

 

[huojinsi]

About contact resistance calculation,it should be included in the foundry's design manual.Usually contact resistance is 0.5 square resistance. The square resitance's value is the resistor that is designed by you.

 

[uncle_urfi]

For RF operation, each contact behaves in a more complex manner. It has to be modeled as an inductance with some capacitance and resistance. The DC resistance is as pointed out above is around 4 ohms per contact. That's why having multiple contacts reduces resistance and improves current flow, and reduces capacitance as well, which may become a high reactance at a certain frequency. Xc=1/(wC)

Check your RF models for a detailed discussion as it relates to the technology that you are using and follow any guidelines there.