Static Power and current leakage in transistor!!

[Avighna]

Static Power!!

What xactly do we mean by static power?

I mean i understand it is the leakage power......and there r a couple of factors which contribute to this leakage power....like
gate leakage
sub-threshold leakage
pn junction leakage

what do we mean by the above three? i.e. gate leakage,sub-threshold leakage,pn junction leakage..
could someone help me understand the concept of this static power in detail....or is there any material from where we cud understand this stuff clearly!!!

Plzz kindly help!!!!

 

[ckaa]

Re: Static Power!!

Try these two links. They should answer your questions.

https://asic-soc.blogspot.com/2008/04/sub-threshold-current.html#

focus.ti.com/lit/an/scaa035b/scaa035b.pdf

You could also try any of the semiconductor device physics books. They should have sections on CMOS static power.

 

[koggestone]

Re: Static Power!!

Hope u know that transistor has 4 terminals

gate
source
drain
body


gate leakage - current leaking from gate to source.
sub threshold leakage - current leaking from drain to source.
pn junction leakage - current leaking from drain to body.

some other trivia info.
- in 65nm process, gate oxide is 1.2nm thick . In other words just
5 atoms thick ( yes we are talking atoms) . hope u can now imagine
how easy for electrons to flow between gate and source thru these
5 atoms and hence gate leakage is becoming an issue.

how to fix gate leakage ?
Ans - using something thicker than 5 atoms . that's what that fancy
word HKMG ( High K metal Gate) is about . capacitance = K .A . e0/ d
to keep capacitance constant , if u increase d , then u have to increase
K also ( hence the word high K).

check out these 3 courses at stanford (ee271,ee313,ee371) for good
lectures on digital vlsi.