Memristor has been used, by some, as a catch-all term for a diverse collection of two-terminal memory types that display variable resistance. Many are being researched as potential replacements for established memory types such as flash memory and DRAM.
Discussion was stimulated by the publishing of a theoretical paper by Blaise Mouttet, of Arlington, Virginia, on arXiv.org that was critical of HP's adoption of the memristor terminology and of earlier work by Chua.
The spokesperson said in email: "HP is proud of the research it has undertaken into memristor technology and the recognition this has received in the scientific community. In a little over three years, our papers, which were subject to rigorous peer review before being published in leading scientific journals, have been cited more than 1,000 times by other researchers in the field. We continue this research and collaboration with the electronics industry to bring this important technology to market."
I do not believe that was intended to be a deflection, just something along the lines of "We would agree with you if you were right" .... or the academic equivalent of just because you don't understand something does not mean that it is not true.
Question though, is there a difference between a dynamic system (complex) and a single element that display a certain characteristic. I can design a complex circuit element that looks to the external world like a resistor. That does not of course make it a resistor. Debate?
Very interesting indeed. So, it sounds like the pinched hysteresis curve is the only requirement for this memristor, and anyone who thinks that there MUST also be a flux and charge relationship is simply being too hard-core literalist about it? Could be.
I can dream up a memristor without too much trouble. Just imagine sending a large AC current through a regular resistor, more than the resistor is "rated" for. The resitor heats up, changing its resitance value as current becomes greater.
Then the sine wave goes past its peak, and the current value decreases.
As the resistor cools, its resistance again changes, but not at the same rate as when the resitor was heating up. Assume that when the current was going up towards the peak value, and reached a value of .9i, the resistance was R1. When current started descending from the peak, and again reached a value .9i, the resistance of the now-cooling resistor is R2.
Not so hard to imagine. For example, it's easy enough to think of the resistor being slightly cooler when the current was increasing, and slightly hotter, at a given current value, when the current is decreasing.
The hysteresis curve is pynched, because this is a resistor, so when v=0, i=0, simply because there is no stored charge or magnetic flux.
And the next also-not-too-difficult conceptual exercise was to imagine similar properties for capacitors and inductors. Values of C and L that vary over time, as voltage is applied.
Join our online Radio Show on Friday 11th July starting at 2:00pm Eastern, when EETimes editor of all things fun and interesting, Max Maxfield, and embedded systems expert, Jack Ganssle, will debate as to just what is, and is not, and embedded system.