RE: [ng-spice] Diode problems - continued


To "'ng-spice@ieee.ing.uniroma1.it'" <ng-spice@ieee.ing.uniroma1.it>
From "Gillespie, Alan" <Alan.Gillespie@analog.com>
Date Wed, 16 May 2001 13:19:28 +0100
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Reply-To ng-spice@ieee.ing.uniroma1.it


Using my last compiled version of ngspice (14pre2 I think), I get
some strange results. I'm running the following :-

* DIODE test circuit

D1 A C DPB_NP1
VA A 0 dc -5.0 pwl 0 -12 10u 1 15u 1 20u -12
VC C 0 dc 0

****** Start of ghs File ******

*.OP
*.dc va -11 -9 1m
.tran 100n 20u

.save all
+ @d1[vd]
+ @d1[id]
+ @d1[gd]
+ @d1[cd]
+ @d1[charge]
+ @d1[capcur]

.MODEL DPB_NP1  D IS=2.29E-15 CJO=7.88E-12 VJ=1.2E+00  M=4.63E-01 RS=10
+ BV=10 TT=1u

.options nomod tnom=25 temp=25 ACCT
+ reltol=0.00002 abstol=0.1p vntol=1u

****** End of ghs File ******

.END 

The saved parameters don't make any sense, but the current in the
voltage source looks okay, suggesting that it's just a parameter
saving problem. But closer inspection shows that the TT model
parameter has no effect, so we seem to have more than one problem.

Cheers,

Alan

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