As a "concept simulation tool", NL5 is able to simulate any schematic ideas generated by engineer. First, there are "no limits" on circuit topology: you can do anything you want, and NL5 should successfully perform simulation even if such a schematic can not be implemented in real life. Second, there are "no limits" on component parameters: almost all of them can be set to zero, infinity, negative or positive values, and NL5 should handle that as well. And third, there are "no limits" on schematic operating range: voltage, current, time, and frequency. There are no any absolute or relative tolerance settings: picoamps and megaamps, nanovolts and gigavolts may exist in the same schematic at the same time.
In other words, NL5 does not expect engineer to do "right" things, and it does not limit engineer in what he is able to do. Instead, it allows evaluating any "silly" and "crazy" ideas with components that do not exist (at least today, but who knows about tomorrow...), and parameters that may not make sense in real life. While Spice simulation is very often limited by real world "rules and conditions", and thus it may easily fail if something is "not-real", NL5 is designed and optimized for "ideal" world of your imagination. It does not care what you do, it just gives you true results on schematic you entered. No questions asked.
I believe such a "no limits" capability is exactly what is needed for initial design process: quickly evaluate and iterate any "non-real" design ideas, and finally converge to "real" schematic, ready for rigorous Spice analysis.
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