The other problem with feedback (as in a "bus-hold" circuit) is that the
I/V curve has hysteresis. There is some range of voltages over which
there are two possible current values. Which one you get depends on
previous history (i.e., whether you ramp up or down).
A non-monotonic I/V curve means the device is capable of being an
amplifier within that region, and depending on its load, may oscillate.
Sometimes it doesn't actually oscillate but causes the simulator to
become unstable or otherwise run into numeric difficulties.
Regards,
Andy Ingraham
Received on Tue Nov 10 14:39:25 1998
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