MIsmatch in current mirrors

[deepa]

in current mirrors,the Vt mismatch seem to dominate,can anyone tell the physical interpretation of this

 

[qutang]

the implant ion is not equal every inch, so the vth will be different. Id is square of vth , so the different is large.

 

[gingerjiang]

when adjusting the threshold, nonuniform ion implant causes unequal vth

 

[hung_wai_ming@hotmail.com]

h**p://ece-www.colorado.edu/~bart/book/book/chapter7/ch7_4.htm

Check above link
it depends on Cox and ion implantation concentration and final profile. Hard to control for both