The answer is in the LTspice built-in Help document, but I thought it was worthwhile to explain WHY this is the answer and the context for it. Perhaps a related question here: LTSpice active load current generator soft saturation suppling 2A current to the circuit but dissipates \$ 16A*2V=32W \$ ?! Isn't a load a component or a sub-circuit that sinks current and dissipates energy? Current source supplies energy to the circuit - how could it supply and dissipate energy at the same time (i.e.
I don't understand how a load can be modeled as a current source.It makes no sense to me that the current source can sink 16A while I've already fixed it a DC value of \$ I_1 = \$ 2A - where is this extra 12A comes from?.If I then checked the "active load", current stays at 2A only when \$ V_1 > 0.5V \$, and if \$ V_1 = -2V \$, the current source miraculously supplies -16A!
Without being checked as an "active load", the current source behaves just like how a current source should be - supplying a constant 2A current (upper schematic).
I plotted out the schematics, one with the active load checked and the other without, and compared their traces. I don't understand what Parasitic Properties: This is an active load means in LTSpice provided as an option in the current source configuration window.
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