PING: Aylward or other Spice Expert

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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| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
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Jim Thompson
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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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Kevin Aylward

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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| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
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Jim Thompson

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

-- Kevin Aylward

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Kevin Aylward

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

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| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
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Jim Thompson

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