Re: SPICE AC analysis -- multiplying or dividing signals


"Jim Thompson" <To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx> schrieb im
Newsbeitrag news:po7rh2lplfdtiobb4rh6kvl95lgaesofrn@xxxxxxxxxx
On Sat, 30 Sep 2006 00:20:54 +0200, "Helmut Sennewald"
<helmutsennewald@xxxxxxxxxxx> wrote:

"Joel Kolstad" <JKolstad71HatesSpam@xxxxxxxxx> schrieb im Newsbeitrag
news:12hr43rq4qd20b@xxxxxxxxxxxxxxxxxxxxx
Hi Helmut,

"Helmut Sennewald" <helmutsennewald@xxxxxxxxxxx> wrote in message
news:efk0um$22p$01$1@xxxxxxxxxxxxxxxxxxxx
It's impossible to multiply or divide two AC-signals in a useful way
for
.AC-analysis.
Multiplying two AC-signals would result in doubling the frequency.
This is not the concept of the AC-analysis in SPICE. AC-analysis is a
pure
linear analysis by definition.

Hmm... I think I see what you mean. However, I don't want to perform
"instantaneous" mixing, as you suggest, I just want to multiple two
phasors (complex numbers) together at each frequency point to get a new
one.

Hello Joel,

I exactly know what you wnat to do. Believe me, your idea is not possible
with the concept of the .AC-analysis in SPICE.
You can do what you need in the waveform viewer of LTspice of course.

Best regards,
Helmut

thinking there's no way to set up the matrix in AC analysis to try to
solve for V(node1)*V(node2), yet of course once V(node1) and V(node2)
are
known it's trivial to calculate V(node1)*V(node2) using the post
processor. I guess I'll settle for that.

I suppose this is why the traditional "voltage controlled voltage
source"
can only multiple by a constant...

---Joel


You can certainly do phasor multiplication with behavioral sources in
PSpice.

...Jim Thompson


Hello Jim,

please show me a SPICE netlist which can do that.
We don't talk about PROBE.

Best regards,
Helmut




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