PING: Aylward or other Spice Expert

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Jim Thompson 8 years ago

PING: Aylward or other Spice Expert...

Bringing up a 0.18u/0.35u Vanguard process, building up the PSpice model libraries.

Discovered strangeness:

ALL devices have HDIF=0.2u, except "native" NMOS, which has HDIF=0.02u!!

I thought this might simply be a typo, but that HDIF value is repeated in each of the corner parameter statements.

0.02u seems awfully small to me.

Can this be correct? ...Jim Thompson

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| 1962 |

I'm looking for work... see my website.

Thinking outside the box...producing elegant & economic solutions.

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Kevin Aylward 8 years ago

Nope. It can't be less than the contact width for starters!

hdif is half the diffusion width of the S/D. 2 x hdif has to be larger than the contact square side because the contact sits in it!

If you could draw lines at 0.02u, it would be a 0.02u process...

So, imagine a S or D strip, with a row of contacts in it. 2 X hdif is the width of the strip, by definition. hdif allows the parasites to be calculated.

i.e.

AD=2*hdif * W

AS=2*hdif * W

PD=2*2*hdif + 2*W

PS=PD=2*2*hdif + 2*W

Is what I have SS do when I added hdif to the engine.

If I don't have the data of hdif for a process, I add maby 20% to the process min geometry as a guess.

-- Kevin Aylward

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Jim Thompson 8 years ago

Yep. Precisely what I do in PSpice...

(PSpice doesn't natively do binning, so I devised my own way ;-)

(Should say 'PMOS' in the description :-[ ...Jim Thompson

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Kevin Aylward 8 years ago

So... you were just looking for an accomplice then....

-- Kevin Aylward

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Jim Thompson 8 years ago

Just wanted to make sure I wasn't missing something ;-) ...Jim Thompson

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PING: Aylward or other Spice Expert

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