what is the finger space for layout matching?

[zhangljz]

Hello guys,

When we convert a big transistor to several small fingers, which space between the fingers shall we choose? The minimum space? Will it impact matching?

Thanks

 

[dick_freebird]

I believe any match data from fingered devices will be
from standard minimum groundrules, and you may as
well stick with that absent any guidance that exercises
your finger-spacing dimension.

As a rule bigger is better, but you have nothing quantitative
to say how much is worth it and how much is wasted. Do
you?

Everything impacts matching. Your threshold of concern
can probably ignore all but some critical devices. With no
data to set that threshold, I say fuggedaboudit.

 

[zhangljz]

Thank you.