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Okay. Sure, I see that; but it is only changing the direction in the positive feeback path, correct? The current througth the source is always the same direction, correct? Because for when R=40K, current will flow from source (5-1.59)/100; similarly, when R=22K, current will still flow from source in the same direction (5-0.87)/100, correct? So not necessarily current should always flow into the power supply, as exmplained in wiki article that we have been referring here !
Okay, it makes a lot of sense. And, I was able to compute all the numbers; thanks a lot. However, one last thing that I have a question is that it seems like for a NIC circuit we have a case where the power supply will be sinking current, and that is why we get the negative sign for the current (Is), as explained here en.wikipedia.org/wiki/Negative_impedance_converter. But in this example, the power supply will always be sourcing current ! So does this mean that even though NIC have a negative sign for Is, it may not necessarily sink current all the time !?!
