Re: gEDA-user: log scale DC sweeps in ngspice

[asomers@xxxxxxxxx]

That sounds like it could work.  I'll give it a try...

On Thu, Jan 14, 2010 at 9:14 PM, John Doty <jpd@xxxxxxxxx> wrote:
>
> On Jan 12, 2010, at 8:41 PM, asomers@xxxxxxxxx wrote:
>
>> I'm trying to do DC parameter sweeps in ngspice.  I'd really like to
>> do them in log scale, but it seems that ngspice only supports linear
>> scale for DC sweeps.  Over the input range I'm simulating, a linear
>> sweep takes far too long.  So I'm looking for a workaround.  I thought
>> that maybe I'd do the sweeps piecewise linear, with maybe 10 points
>> per decade over several decades and then combine the results.
>> However, I can't find any way in ngspice to concatenate two vectors.
>> Does anybody know of any workarounds for this depressing situation?  I
>> don't want to invoke any postprocessing in a different programming
>> language, because I'm trying to write scripts for multiple simulators
>> (gnucap, ngspice, qucs) that all output data in the same format.  Any
>> help would be appreciated.
>
>
> Do it in the simulation itself. Sweep a voltage source. Feed it to a diode
> to make a current that's exponential with voltage. Convert the current back
> to a voltage with a current controlled voltage source block.
>
> John Doty              Noqsi Aerospace, Ltd.
> http://www.noqsi.com/
> jpd@xxxxxxxxx
>
>
>
>
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