sensasi: [LTspice] Re: .re-do analysis with a different set of parameters

Selasa, 19 Februari 2008

[LTspice] Re: .re-do analysis with a different set of parameters

--- In LTspice@yahoogroups.com, "Jim Booth" <boothjg@...> wrote:
>
> Thanks,
>
> So the point I missed, I guess, is that the method can only deal with
> two components? I didn't see the word "pairs" in your reply, but I
> keyed off of "To simultaneously step more than one component
> value..." because that's what I want to do. I was confused by the
> description of table in the .param help.
>
> Is there a way to do what I'm trying to do? It's a Design of
> Experiments. I can modify the schematic 19 times and do individual
> runs, but I thought there must be a way to do automated "cases", for
> lack of a better word.
>
> Jim

Helllo Jim,

It looks you haven't fully understand his correction.
You can vary as many devices you you like. LTspice will
simulate 19 times with n=1 to 19 and it will take a value
for each step from the tables.

.step param n 1 19 1 ; step n from 1 to 19 by 1
.param C1=tbl(n,1,10p,2,33p,3,1p,....)
.param C2=tbl(n,1,15p,2,22p,3,5p,....)
.param C3=tbl(n,1,100p,2,220p,3,50p,....)
.param R1=tbl(n,1,1k,2,10k,3,200,...)
...

Best regards,
Helmut

>
> --- In LTspice@yahoogroups.com, "analogspiceman" <analogspiceman@>
> wrote:
> >
> > --- In LTspice@yahoogroups.com, Jim Booth wrote:
> >
> > > I want it to step through seven components as a group with 19
> > > values for each. An abbreviated spice directive is below.
> > > My understanding is this should pick the first value for each
> > > component, run the sim, then pick the second value for each,
> > > and so on.
> > >
> > > .step param n 1 19 1 ; step n from 1 to 19 by 1
> > > .param C4=table(n,0.00704,0.01056,0.00704,etc)
> >
> > What I wrote before still applies (i.e., table values must
> > be listed in x, y *pairs*. Each output data point requires a
> > corresponding input data point (i.e., an n value in your case).
> > Note that you can omit any inside point pairs that are inline
> > with outer points (the table function generates intermediate
> > values linearly). -- a.s.
> >
> > >> .param R1=tbl(n,1,1k,2,10k,3,200) C1=tbl(n,1,10p,2,33p,3,1p)
> >
>