How to know the mismatch of W and L of a transistor?

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carpa

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transistor mismatch avt

From the document of the foundry I can only know the mismatch of Vt, Vsat, Id. No figure points out the mismatch of the effectivive W and L. How can I know it?
 

mismatch,sigma,transistor -delta

use noise equation such as A/(w*L) to estimate offset vltage, whih A is dependent on your process.
 

rambus_ddr said:
use noise equation such as A/(w*L) to estimate offset vltage, whih A is dependent on your process.
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Thank you for your reply. I am still confused with your noise equation. Can you give me a simple example?
 

You should have the parameters Avt (I forgot the exact name) in your datasheets to caluclate the % mismatches (in sigma) as sigma = Avt/sqrt(W*L). Try to seek it out.
 

carpa said:
From the document of the foundry I can only know the mismatch of Vt, Vsat, Id. No figure points out the mismatch of the effectivive W and L. How can I know it?
Click to expand...

If you draw transistor in different orientation, you will have mismatch w and W
 

sorry, terryssw said is right.
 

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