What does EXTRA_MASK means ?

[fasto2008]

Hello eveyone,
Can somone help me to Know this derived layer from Tanner.
gate=poly & active & not Ext_Mask_Mos
And what is the function of Extra Mask in the circuit ?

Thank a lot for your help

 

[jianjing526]

Extra_Mask is the mask besides normal maskes. For example, nwell is a normal mask in psub process while zener implantation is the extra_mask!

 

[shitansh]

hi,

Basically from layout drawing Gate/MosTransistor is defined by overlaping of poly and active layer.

while in drawing of an invertor poly crosses n-well also but over laping of poly and n-well can not defined as gate or Transistor.

HTH

 

[sarathmandepudi]

hi..sir...see..for...one thought...if useful..at least 1bit of my help.....
https://books.google.co.in/books?id...=X&oi=book_result&resnum=8&ct=result#PPA40,M1

 

[wangyufn]

It depends on your technology. For example, it might be used to define Normal VT, Low VT or Zero VT transistors. So some extra masks are needed and they will also be needed when stream out.