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Startup Beats HP, Hynix to Memristor Learning

Memristor learning on any chip
7/7/2015 00:01 AM EDT
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R_Colin_Johnson
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Re: High Cost
R_Colin_Johnson   8/29/2015 1:59:27 PM
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Yes. Your right. Later this year there will be less expensive material/architecture versions (from another company) but I'm bound by NDA. Stay tuned.

resistion
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High Cost
resistion   8/29/2015 7:52:44 AM
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I see the main problem is high cost, due to the use of silver, chalcogenide materials, and the large footprint of SRAM.

The thing is "memristive" or neural-type behavior can be achieved by other means not just CBRAM. Therefore cost and manufacturing feasibility are still strong considerations.

Ron Neale
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Re: It's a plating bath with positives
Ron Neale   8/29/2015 4:56:33 AM
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Colin:   What I think they have going for them is non-volatile high resolution read pulse-integration at low current levels. Assuming all the other parameters associated with temperature, data retention times, write erase endurance are OK.

Having had some experience of silicon fabrication and BEOL at a separate locations that part of the business model is a potential weakness. They will need to write a very careful contract to avoid the problems with the silicon of " It was good when it left here etc. etc." It needs some ability to test before the BEOL step.

R_Colin_Johnson
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Re: It's a plating bath
R_Colin_Johnson   8/28/2015 10:35:00 PM
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Ron: I suppose my question of the day would be if some other large company arrives on the scene with a programmable analogue device will that be a problem for Knowm Inc?

There are many beating down that same trail. In fact the only bitg semiconductor company I know of that is not is Intel--and they probably have a skunkworks going somewhere in their organization.

The analysts say Knowm is onto something uniquely better than the other guys, but only time will tell--as you mentioned

Thanks for the thougtful comment.

Ron Neale
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It's a plating bath
Ron Neale   8/28/2015 7:15:50 PM
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Colin: While Memristor or any other fancy name can be attached to all manner of devices Oxidation-Reduction at each electrode as a function of the direction of current already has a name, it is called an electro-plating bath. What is more interesting in this device is the mechanism that allows ions to move through a solid chalcogenide (assuming at the time it is a solid).

In operation while it is easy to see how the growth of a metallic filament in a plating bath can reduce its two terminal resistance in an analogue manner in relation to the accumulated number of read operations. Is there some RESET operation that removes the accumulated reads at saturation, i.e full bridging? Or is there some time interval measured in clock cycles at which the devices are RESET, or devices without a recent read get reset, or does some other mechanism like say diffusion effect just cause a slow loss of loss of memory emulating the brain?

If for a PCM in the SET state the leading edge of a small iterative RESET pulse is used for read and the remainder of the pulse used for a partial RESET why does that not achieve the same result., i.e. an resistance that is a function of number of accumulated read cycles?

I suppose my question of the day would be if some other large company arrives on the scene with a programmable analogue device will that be a problem for Knowm Inc?

R_Colin_Johnson
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Re: CBRAM is not memristor
R_Colin_Johnson   7/8/2015 5:58:40 PM
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Yes, you are right. Dr. Chua just responded to me that: "they are both memristors because they use 'resistance' measured across the device as the binary bit. Please note any two-terminal device which uses its resistance as the binary bit is a memristor. See why from the following paper: 'Reistance switching memories are memristors'. Applied Physics  A, 102, p. 765, 2011." Exactly the publication that you cite. Good call.

R_Colin_Johnson
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Re: similarities
R_Colin_Johnson   7/8/2015 5:48:49 PM
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resistion: Dr. Chua says that he considers both to be memristors, and any other RRAM, because they use  "resistance" measured  across the device as the binary  bit.

A Sceptic
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CBRAM is not memristor
A Sceptic   7/8/2015 12:00:08 PM
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These devices are part of a memory class called resistance switching memories. In the literature they are referred to as CBRAM (conductive bridge random access memory), PMC (programmable metallization cell), ECM (electrochemical metallization cell). The physical functioning of such memory devices has nothing to do with the hypothetical "memristor" concept, viz. the "fourth basic electric circuit element". So one really wonders about the connotation "CBRAM <-> memristor". Seems that the tremendous confusion is due to Chua's publication "Resistance switching memories are memristors" (Appl. Phys. A 102, 765-783 (2011)).

R_Colin_Johnson
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Re: similarities
R_Colin_Johnson   7/8/2015 11:44:16 AM
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resistion Adesto's CBRAM looks like a memristor to me, and Crossbar Inc. is making RRAMs, which use memristors, but not for their analog qualities. Nevertheless I've queried Dr. Chua to see what he thinks. 

R_Colin_Johnson
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Re: entitlement of analog computers
R_Colin_Johnson   7/8/2015 11:25:44 AM
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The goal was always to build an "electronic brain" that was as smart and low power as human brains. That led to neural networks, which led to memristors as the only known single component that could possibly be fabricated densley enough and which consume very little power when being used and no power when idle. Now putting all that together is a job for our successors, and many believe it will never happen. Nevertheless, the entitlement (if I understand your usage) of an "electronic brain" is definitely worth the developent effort--even if it takes centuries. The entitlement of all the steps along the way may not be, since digital computers can simulate bits and pieces of the solution well enough to tackle Big Data and Deep Learning--the current needs in two buzzwords.

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