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

[carpa]

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?

 

[rambus_ddr]

mismatch,sigma,transistor -delta

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

 

[carpa]

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

Thank you for your reply. I am still confused with your noise equation. Can you give me a simple example?

 

[terryssw]

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.

 

[tomachao]

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?

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

 

[rambus_ddr]

sorry, terryssw said is right.

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

Thank you for your reply. I am still confused with your noise equation. Can you give me a simple example?