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February 2021 StudentZone Quiz Solution

QUESTION:

What is the minimum voltage that the current source needs across it to maintain a more or less constant current, by analyzing the LTspice plots for the circuits?

ANSWER:

Considering the LTspice plots provided in the activity, with sink tied to negative supply:

And sink tied to positive supply:

We may notice that in both cases the current becomes more or less constant after reaching a voltage around 0.8-0.9V.