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[Help-gnucap] newbie: edit and BJT's
From: |
Hugo van der Merwe |
Subject: |
[Help-gnucap] newbie: edit and BJT's |
Date: |
Wed, 2 Oct 2002 15:21:19 +0200 |
User-agent: |
Mutt/1.4i |
I've recently started playing with gnucap (in the past I used ng-spice
a little). Something I noticed as odd was this:
Starting with a clean gnucap session, I type edit, and add e.g.:
Q1 1 2 3 4 tr2n2222
Save, quit. Run edit again, it presents:
Q1 1 2 3 4 tr2n2222 area= 1. icvbe= NA icvce= NA temp= NA
Seeing this doesn't surprise me, but exit the editor again:
... 2 3 4 tr2n2222 area= 1. icvbe= NA icvce= NA temp=
^ ? what's this?
Running edit again presents:
Q1 1 2 3 4 tr2n2222 area= 1. icvbe= 0. icvce= NA temp= NA
Quitting results in complaint about the next NA, and so it continues
until all turn to "0". Curious.
The other thing, is there something clearly wrong and/or unimplemented
in this model:
* Fairchild Semiconductor 2N3904
.MODEL tr2N3904 NPN (Is=6.734f Xti=3 Eg=1.11 Vaf=74.03 Bf=416.4 Ne=1.259
+ Ise=6.734 Ikf=66.78m Xtb=1.5 Br=.7371 Nc=2 Isc=0 Ikr=0 Rc=1 Cjc=3.638p
Mjc=.3085
+ Vjc=.75 Fc=.5 Cje=4.493p Mje=.2593 Vje=.75 Tr=239.5n Tf=301.2p Itf=.4 Vtf=4
Xtf=2 Rb=10)
Both ng-spice and gnucap present very strange results when I use this in
a cascode amplifier circuit instead of a 2N2222. (I can send this
netlist if needed.)
That brings me to my last two question at this moment:
Is there some place to find a nice summary of what has been implemented
and what has not in terms of spice2/spice3 compatibility?
How far down the line might monte-carlo analysis be, years, or months?
Thanks,
Hugo van der Merwe
- [Help-gnucap] newbie: edit and BJT's,
Hugo van der Merwe <=