tt, ff, ss process corners

[MK28]

i am simulating my amplifier for different process corners...i've noticed for different process corners simulation the current consumption is different !!!

Can anyone tell me.....why the current consumption is different for different process corners,,,,what is it actually happening that causes the current to increase for ff(fast-fast), and then decreases for (slow-slow)?

anyone,,,please

 

[walker5678]

On ff corner, transistor has lower Vth, so current increase, and on ss corner, higher Vth makes current decrease.

 

[williamy]

in different corner, the depth of oxide is different

 

[davidwong]

different corner will have different performance result.
this is the difficulty in analogue desgin