ltspice
I have been looking for this for an hour and there is no single example or information about it in English language. The nearest ones are like this and there is no explanation I don't even know it is correct. No tutorial, no example, no diagram ect.
I used search still no luck:
As an example how can we modulate a 1k carrier signal with a 10Hz signal by using the the built-in MODULATOR? (AM not FM)
I don't know exactly how to make it look right, but you can select a single step with an @x behind the node you are inspecting. The single line gets multiple colors, that is a bit strange, but maybe it can be fixed if you select the color yourself.
For example:
This feature is actually documented in the LTSpice Help under the Waveform Viewer -> Waveform Arithmetic topic:
The step selection operator, '@' is useful when multiple simulation runs are available as in a .step, .temp, or .dc analysis. It selects the data from a specific run. For example, V(1)@3 would plot the data from the 3rd run no matter what steps where selected for plotting.
The complex part will either be a capacitor or an inductor. Just figure out the value for such component starting out with how much reactance you want. And that component will have to be in series with a resistor which is the real part.
Now if you happen to have a negative real part, you need to simulate a negative resistance, which can be done in LTSpice. Click here to see how you could do it if you had a negative real part
Best Answer
As stated in the help:
So you place that component, connect the bottom port to GND, and write the frequencies you want into the
Valuepart in the format ofmark=xyz space=abcmark will be the frequency when 1 V is supplied to FM and space the one when 0 V is supplied.At the AM port you just put some sine or whatever: