# About the subthreshold swing in SOI CMOS

S

#### Schmit

Jan 1, 1970
0
For fully depleted SOI, some book says it can reach a nearly 60mV/Dec
swing because its effective gate depletion width is large. What does
"effective gate depletion width" mean ? I have only heard of "depletion
width" in a bulk CMOS. Is it a unique advantage of SOI ? I am
suspicious about it. If the depletion width (Wd) of bulk CMOS can be
made big enough, then the control coefficient m=1+3tox/Wd also can
approach 1.
Thanks for attention

S

#### Schmit

Jan 1, 1970
0
I think I got the answer.
Thanks a lot.

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