"reverse diode"

There will always be a junction potential to overcome.

hundred mV above 0V.

could be tricky.

made based on fundamental physical principles so that it behaves very similar to a "reverse diode"(by which I do not mean a reverse biased diode... so please do not conflate the two).

exist? i.e., Is it possible to have a semiconductor device with an IV curve that

Ohm's law is your enemy.

in a JFET?

In a DIODE junction. Learn to read.

forward voltage and high impedance at some larger voltage?

al hundred mV above 0V.

e made based on fundamental physical principles so that it behaves very sim= ilar to a "reverse diode"(by which I do not mean a reverse biased diode... = so please do not conflate the two).

exist? i.e., Is it possible to have a semiconductor device with an IV curve= that **looks** like I(V) =3D 1/V or 1/V^2?

Probably not, but search on the tunnel diode, which does have a distinctly = kinky I(V) curve.

You could even buy one.

--=20 Bill Sloman, Nijmegen

A PTC current limiting fuse acts something like this. Also a tungsten = lamp.

If it does not need to be reversible a fuse would fit this definition.

A tunnel diode may also be similar but it needs to be biased, and then = it=20 has negative resistance.

Is there a proposed application for a device having this property?

Paul=20

Sure thing. A depletion FET with gate and source connected, or a classical two-terminal BJT current limiter. (Series pass transistor, base connected to collector via big R, sense transistor's BE connected across a sense resistor steals base current when the drop across the sense resistor reaches V_BE.)

You can add foldback, so that the current decreases at increasing delta-V.

Cheers

Phil Hobbs

forward voltage and high impedance at some larger voltage?

hundred mV above 0V.

based on fundamental physical principles so that it behaves very similar to a "reverse diode"(by which I do not mean a reverse biased diode... so please do not conflate the two).

i.e., Is it possible to have a semiconductor device with an IV curve that

forward voltage and high impedance at some larger voltage?

hundred mV above 0V.

made based on fundamental physical principles so that it behaves very similar to a "reverse diode"(by which I do not mean a reverse biased diode... so please do not conflate the two).

exist? i.e., Is it possible to have a semiconductor device with an IV curve that

If you are not too picky about voltages, an Esaki diode has low Z at and near 0V, and then the Z increases at the valley...

No. Tunnel diodes conduct in *both* directions.

But it *doesn't reverse block*.

You guys are making it difficult , A incandescent lamp! :)

But, if you need diode like behavior? Selenium rectifier !

Yeah, I know, ,

Jamie

A copper oxide rectifier would possibly work. Aeons ago, I had a wave analyzer that used those.

I know; use your imagination.. Use two in series; one has minimal peak current characteristic - that one is used as a "super rectifier with a rather low "reverse" voltage rating. Does the OP need a diagram?

See my previous reply.

...that that solution "stinks".

Perhaps you should read the description of the circuit. What is described is not a junction diode.

I suspect that would oscillate with any parasitics present, maybe at GHz frequencies.

It can be difficult to get tunnel diodes to do *exactly* what you want, although *something* will usually happen.

BTDT.

forward voltage and high impedance at some larger voltage?

hundred mV above 0V.

based on fundamental physical principles so that it behaves very similar to a "reverse diode"(by which I do not mean a reverse biased diode... so please do not conflate the two).

i.e., Is it possible to have a semiconductor device with an IV curve that

A current regulator diode (fet Idss) exhibits a linear relatioship as described.

PTC's exhibit a self regulated temperature profile, basically a constant power characteristic.

If you want nonlinearity, the fuse or breaker comes closest.

RL