Is there a passive device similar to a diode that has low impedance at 0 fo= rward voltage and high impedance at some larger voltage?
e.g., flip the diode curve horizontally then center the knee of the several= hundred mV above 0V.
One can emulate such a device a number of ways more or less but can one be = made based on fundamental physical principles so that it behaves very simil= ar to a "reverse diode"(by which I do not mean a reverse biased diode... so= please do not conflate the two).
Is there any simple reason why such a semiconductor based device can not ex= ist? i.e., Is it possible to have a semiconductor device with an IV curve t= hat **looks** like I(V) =3D 1/V or 1/V^2?