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For the upcoming spice model 2012

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New 2010.2 Release is Available for Advanced Spice Modeling

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skip bias point calculation

Hi, I want to ask. What is exactly "Skip initial transient bias point calculation"? When I tried to simulate my circuit, there is an error of convergence. But when I click the skip button, there is no more this error. Can you tell me what is the purpose of this button?

VSIN.Normal

Hello, I would like to know how to change automatically frequency and amplitude of VSIN.Normal thanks for your answer Ol

tantalum capacitor model

I would like a model of a tantalum capacitor that is as extensive as possible.

Re: Re: Re: Re: .Probe Card Ignored

Hi, I've modified the code: .PLOT AC VDB(5) But still nothing comes out...

Re: Re: Re: .Probe Card Ignored

The proper .PLOT syntax is:

.PLOT PLTYPE OV1 [ (PLO1, PHI1) ] [ OV2 [ (PLO2, PHI2) ] ... OV8 ]

The PLOT line defines the contents of one plot of from one to eight output variables. PLTYPE is the type of analysis (DC, AC, TRAN, NOISE, or DISTO) for which the specified outputs are desired. The syntax for the OVI is identical to that for the .PRINT line and for the plot command in the interactive mode.
In your query, you are missing the type of analysis.

C

Re: Re: Re: .Probe Card Ignored

Hi,

You're right. There is no .probe in MacSpice. So I use .plot to plot the frequency response of the circuit:

.Plot dB(V(5))

But now, nothing is generated but only this message:
Note: MacSpice converts spice2 'polys' to spice3 'B' sources, use 'listing physical expand' to inspect the result(s).
Note: Spice2 'poly' source translated at line 30.
Note: Spice2 'poly' source translated at line 31.

So I type "listing physical expand",

1 : MMG OPAMP AMPLIFIER
3 : vs 1 0 ac 1 sin(0 1 40hz)
5 : r2 2 0 430
6 : r1 2 5 15k
7 : c1 2 5 1n
23 : c:op:1 op:11 op:12 3.498e-12
24 : c:op:2 op:6 op:7 15.00e-12
25 : d:op:c 5 op:53 op:dx
26 : d:op:e op:54 5 op:dx
27 : d:op:lp op:90 op:91 op:dx
28 : d:op:ln op:92 op:90 op:dx
29 : d:op:p 4 3 op:dx
30 : * egnd 99 0 poly(2) (3,0) (4,0) 0 .5 .5
30 : b:op:sp2_egnd op:99 0 v=(0+v(3)*.5+v(4)*.5)
31 : * fb 7 99 poly(5) vb vc ve vlp vln 0 4.715e6 -5e6 5e6 5e6 -5e6
31 : b:op:sp2_fb op:7 op:99 i=(0+i(v:op:b)*4.715e6+i(v:op:c)*(-5e6)+i(v:op:e)*5e6+i(v:op:lp)*5e6+i(v:op:ln)*(-5e6))
32 : g:op:a op:6 0 op:11 op:12 282.8e-6
33 : g:op:cm 0 op:6 op:10 op:99 8.942e-9
34 : i:op:ss 3 op:10 dc 195.0e-6
-- hit return for more, ? for help --
35 : h:op:lim op:90 0 v:op:lim 1k
36 : j:op:1 op:11 2 op:10 op:jx
37 : j:op:2 op:12 1 op:10 op:jx
38 : r:op:2 op:6 op:9 100.0e3
39 : r:op:d1 4 op:11 3.536e3
40 : r:op:d2 4 op:12 3.536e3
41 : r:op:o1 op:8 5 150
42 : r:op:o2 op:7 op:99 150
43 : r:op:p 3 4 2.143e3
44 : r:op:ss op:10 op:99 1.026e6
45 : v:op:b op:9 0 dc 0
46 : v:op:c 3 op:53 dc 2.200
47 : v:op:e op:54 4 dc 2.200
48 : v:op:lim op:7 op:8 dc 0
49 : v:op:lp op:91 0 dc 25
50 : v:op:ln 0 op:92 dc 25
51 : .model op:dx d(is=800.0e-18)
52 : .model op:jx pjf(is=15.00e-12 beta=270.1e-6 vto=-1 level=1)
9 : vpos 3 0 5
10 : vneg 0 4 5
56 : .ac dec 100 1 100k
------ : .end

I have no idea what does the list tell. Is there something I need to change in order to plot out the frequency response?

Thank you for your attention.

Re: Re: .Probe Card Ignored

Re: .Probe Card Ignored

AFAIK, .Probe refers to MicroSim PSpice. I don't know if MacSpice supports this command.

C