ngspice

Hy everyone,
I'm sending you this mail so as to light up a problem I got yesterday, =20
while trying to simulate a simple BJT (level 1) whith ngspice.
I made the file essai_BJT.cir as following:

BJT Level 1 ADMS

*.options ACCT
.OPTIONS temp=3D27

vb B 0 dc 0
vc C B dc 0
Q1 C B 0 0 N1
.DC vb 400M 1 20.5128M
.print dc -i(vc)
.print dc -i(vb)

.model N1 npn level=3D1
*+ npn=3D1 pnp=3D0
+ tnom=3D27
+ is=3D1E-016
+ nf=3D1 nr=3D1.01 ne=3D2 nc=3D2
+ ikf=3D2E-2 ikr=3D1E-2
+ bf=3D350 br=3D5
+ vaf=3D50 var=3D5
+ isc=3D1E-20 ise=3D1E-15 irb=3D3E-2
+ rb=3D100 rbm=3D20 re=3D5.2 rc=3D0
+ cje=3D15E-15 cjc=3D8E-15 cjs=3D4E-15 xcjc=3D1
+ vje=3D0.75 vjc=3D0.75 vjs=3D0.75 vtf=3D5
+ tf=3D3.2E-12 tr=3D100E-12
+ itf=3D2E-2 ptf=3D1
+ mje=3D0.33 mjs=3D0.33 mjc=3D0.33 xtb=3D0 eg=3D1.11 xti=3D3  xtf=3D10
+ af=3D1 kf=3D0 fc=3D0.5
*+ fte=3D1 kb=3D0 ab=3D1 fb=3D1 area=3D1



************************** CONTROL *******************
.control
.endc


.END




Ant it turned out that I was not able to simulate the circuit when Rc =20
wasn't NULL.
Only Rc=3D0 prevented me from getting the error message:

> ngspice -b gummel.cir > gummel_batch.log
Assertion failed: IS_SPARSE( Matrix ) && Row >=3D 0 && Col >=3D 0, file =20
spbuild.c, line 277
Abort (core dumped)


Does anybody have got this kind of message before? And could somebody =20
tell me why the simulator does not accept Rc not null?

Thanks a lot...

Helene


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