Later, perhaps in a day or so, I want to write something to describe recent experiences I had that relateĭirectly to the OP's situation, it appears. But this is getting beyond the scope of what I wanted to write out. If you are careful about moving the mouse, you can even get currents into or out of a pin. Or you can click-and-drag in order to get a voltage difference curve.
You can then click on nodes in the schematic to get the curves you want. At that point a blank chart will show up. Once you do all of this, you can right-click and run things. DC card causes a DC sweep using those values shown in your problem statement. STEP card will generate successive values for it.) That causes LTspice to go look for the variable I. LTspice provides a menu option where you can see these cards, in fact! Termsįirst off, you asked about \$V_ tells LTspice that there is an expression to be evaluated and not just a simple number.
#Icircuit run simulation code#
Even to this very day, programs like LTspice turn your graphical schematic into these ancient cards for processing, using the UC Berkeley code or some modern modification of it. There would also be cards that described what was desired as output, too. There was no graphical input at the time. So Spice was designed to read one card at a time, parse it, and process the information into internal tables that represented the schematic, internally. This core component was designed back in the day when we didn't have graphics displays (other than ridiculously expensive research units.) And at the time, we had card punches and card readers. Most Spice programs share a core component developed at UC Berkeley in California which has evolved over the years. Today, that's no longer true and there are more choices. When I started using LTspice many years ago, it was the only free Spice program that included a good schematic capture component. LTspice is one of them and one I use, regularly. There are, today, more than a few free Spice programs available.
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