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Memristor Computer Emulates Brain Functions

Knowm offer three types to prototypers
1/20/2016 05:00 AM EST
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francouzka
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Re: Chua lectures
francouzka   2/11/2016 4:54:29 AM
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Pardon me, but who You say discover the Memristor? Leon Cha?
I am sorry to been in need to give you an history lesson, but, inventor of the Memristor is Bernard Widrow. He did invented Memristor in 1960's

dt_hayden
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Re: Chua lectures
dt_hayden   1/22/2016 5:30:09 PM
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I'm on Lecture #3 and my head is starting to hurt.

M_Alex_Nugent
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Re: Reliability?
M_Alex_Nugent   1/21/2016 12:45:43 PM
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Thank you for the question! Reliability covers a lot of topics. I am guessing you are referring to state retention. The short answer is that we have performed state retention tests for room temperature and 50C. There is no measurable difference. The devices hold state well, and the dominate factor in state decay was not temperature but initialization resistance.

Photodoped-type ion-conducting devices (typically referred to as CBRAM) diffuse Ag throughout the entire cell. Because of that (and for other reasons) they are prone to reliability problems with temperature. Our devices take another approach that leads to a more thermally stable system. The energy required to displace the Ag from the pathway is typically greater than the thermal energy applied.

A complete answer to the question of reliability depends on how the device has been/is being used, what the programmed resistance state is as well as the tolerance to drifting resistance (how many bits of precision over what period of time?), how many cycles the device has already undergone and how much the device has previously been stressed.

Because the applications for memristors are very broad, the best way to answer your specific questions would be to order some raw die or packaged devices and perform the tests yourself. Note that state retention raw data at room temp for Cr, Sn and W devices (as well as a whole lot of other data) is now available. 

R_Colin_Johnson
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Re: Reliability?
R_Colin_Johnson   1/21/2016 10:35:31 AM
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Resistion: they supply the raw data for free, from which you could make such a calculation, but I will send you querey along to them to save you time. Thanks for the thoughtful comment.

resistion
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Reliability?
resistion   1/21/2016 6:43:00 AM
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What's the reliability of these? It looks like the metal ions can diffuse easily even in rest state, or maybe with elevated temperature.

R_Colin_Johnson
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Re: early HP analog memristor
R_Colin_Johnson   1/20/2016 5:35:32 PM
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Traneus: you are verifying one of the principles that Chua harps on--that the world is already full of memristors that we have been using all along. We just used them for their properties, rather than characterizing them as memristors. Thanks for the history lesson--it's been there all along!

traneus
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early HP analog memristor
traneus   1/20/2016 5:17:49 PM
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HP used an analog memristor (a small incandescent lightbulb) in their vacuum-tube audio oscillators. The memristor got hotter with higher currents, and took a while to cool off. Thus, the average resistance increased with higher RMS current. The heating and cooling were slow enough that the resistance did not change significantly over one cycle of the oscillation. Higher resistance reduced the gain within the oscillator, regulating the oscillator's operating level.

R_Colin_Johnson
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Re: Chua lectures
R_Colin_Johnson   1/20/2016 5:05:27 PM
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Yes, Leon Cha is the man--inventor of the memristor (or perhaps I should say he claims to have discovered them)--and the most comprehensive lecturer on how memristors fit into the landscape of electronics theory. Thanks so much for the link to his lectures--well worth a listen.

perl_geek
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Chua lectures
perl_geek   1/20/2016 4:19:15 PM
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If you are interested in memristors, you'ld probably like a series of lectures sponsored by HP; https://www.hpematter.com/event/chua-lectures-first-12-part-series-hp-labs

Objectively, he's a terrible lecturer, very hard to follow, but worth the effort.

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