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From: Wanderer on 13 Apr 2010 14:24
HP found a way to make memristors

http://spectrum.ieee.org/semiconductors/design/the-mysterious-memristor

and I'm trying to make heads or tails of them. If they came in 0805
packages and you could buy them from digi-key, how would you spec
them? They say it has the units of ohms but if its a constant its just
a resistor, so you can't spec a 3 ohm memristor. Can you spec a 3
Weber/coulomb memristor? Doing unit analysis on the equations

R = dv/di , C = dq/dv, L = dphi/di, M = dphi/dq, V = dphi/dt, I = dq/
dt

I get
RC = M/L = idt/di has units of time
L/R = CM = vdt/dv has units of time
LC = (idt)(vdt)/(dvdi) has units of time squared
R/M (idtdv)/(vdtdi) is unit less

Does this thing break traditional circuit analysis?
From: George Herold on 13 Apr 2010 14:34
On Apr 13, 2:24 pm, Wanderer <wande...(a)dialup4less.com> wrote:
> HP found a way to make memristors
>
> http://spectrum.ieee.org/semiconductors/design/the-mysterious-memristor
>
> and I'm trying to make heads or tails of them. If they came in 0805
> packages and you could buy them from digi-key, how would you spec
> them? They say it has the units of ohms but if its a constant its just
> a resistor, so you can't spec a 3 ohm memristor. Can you spec a 3
> Weber/coulomb memristor? Doing unit analysis on the equations
>
> R = dv/di , C = dq/dv, L = dphi/di, M = dphi/dq, V = dphi/dt, I = dq/
> dt
>
> I get
> RC = M/L = idt/di has units of time
> L/R = CM = vdt/dv has units of time
> LC = (idt)(vdt)/(dvdi) has units of time squared
> R/M (idtdv)/(vdtdi) is unit less
>
> Does this thing break traditional circuit analysis?

Yeah back in the news again. The wiki article does OK at explaining
it.

The resistance is a function of how much charge has gone through the
thing.

George H.
From: Jan Panteltje on 13 Apr 2010 15:00
On a sunny day (Tue, 13 Apr 2010 11:24:33 -0700 (PDT)) it happened Wanderer
<wanderer(a)dialup4less.com> wrote in
<b74e200b-933e-4848-a9b4-a9a66a6238d4(a)f17g2000vbd.googlegroups.com>:

>HP found a way to make memristors
>
>http://spectrum.ieee.org/semiconductors/design/the-mysterious-memristor
>
>and I'm trying to make heads or tails of them. If they came in 0805
>packages and you could buy them from digi-key, how would you spec
>them? They say it has the units of ohms but if its a constant its just
>a resistor, so you can't spec a 3 ohm memristor. Can you spec a 3
>Weber/coulomb memristor? Doing unit analysis on the equations
>
>R = dv/di , C = dq/dv, L = dphi/di, M = dphi/dq, V = dphi/dt, I = dq/
>dt
>
>I get
>RC = M/L = idt/di has units of time
>L/R = CM = vdt/dv has units of time
>LC = (idt)(vdt)/(dvdi) has units of time squared
>R/M (idtdv)/(vdtdi) is unit less
>
>Does this thing break traditional circuit analysis?

I did a read very simple explanation:
The electrical current moves some atoms in a grid.
that changes the resistance permanently.
Reversing the current moves the atoms back.
This can be done very fast (much faster then programming FLASH).
I am sure that the chips that will be marketed will have a controller build in,
and you will just be able to interface with it in the usual way.

From: Wanderer on 13 Apr 2010 15:17
On Apr 13, 3:00 pm, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote:
> On a sunny day (Tue, 13 Apr 2010 11:24:33 -0700 (PDT)) it happened Wanderer
> <wande...(a)dialup4less.com> wrote in
> <b74e200b-933e-4848-a9b4-a9a66a623...(a)f17g2000vbd.googlegroups.com>:
>
>
>
> >HP found a way to make memristors
>
> >http://spectrum.ieee.org/semiconductors/design/the-mysterious-memristor
>
> >and I'm trying to make heads or tails of them. If they came in 0805
> >packages and you could buy them from digi-key, how would you spec
> >them? They say it has the units of ohms but if its a constant its just
> >a resistor, so you can't spec a 3 ohm memristor. Can you spec a 3
> >Weber/coulomb memristor? Doing unit analysis on the equations
>
> >R = dv/di , C = dq/dv, L = dphi/di, M = dphi/dq, V = dphi/dt, I = dq/
> >dt
>
> >I get
> >RC = M/L = idt/di has units of time
> >L/R = CM = vdt/dv has units of time
> >LC = (idt)(vdt)/(dvdi) has units of time squared
> >R/M (idtdv)/(vdtdi) is unit less
>
> >Does this thing break traditional circuit analysis?
>
> I did a read very simple explanation:
> The electrical current moves some atoms in a grid.
> that changes the resistance permanently.
> Reversing the current moves the atoms back.
> This can be done very fast (much faster then programming FLASH).
> I am sure that the chips that will be marketed will have a controller build in,
> and you will just be able to interface with it in the usual way.

Yes, I can see it as something exotic in an IC. But I just don't see
it as a fundamental circuit component like resistors, capacitors and
inductors. If I had a circuit with one in it I wouldn't know how to
solve it. Heck I can't even figure out what value to give it.
From: Jan Panteltje on 13 Apr 2010 15:41
On a sunny day (Tue, 13 Apr 2010 12:17:05 -0700 (PDT)) it happened Wanderer
<wanderer(a)dialup4less.com> wrote in
<55d421ff-493c-4166-935b-954c8c500864(a)w16g2000vbf.googlegroups.com>:

>On Apr 13, 3:00�pm, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote:
>> On a sunny day (Tue, 13 Apr 2010 11:24:33 -0700 (PDT)) it happened Wander=
>er
>> <wande...(a)dialup4less.com> wrote in
>> <b74e200b-933e-4848-a9b4-a9a66a623...(a)f17g2000vbd.googlegroups.com>:
>>
>>
>>
>> >HP found a way to make memristors
>>
>> >http://spectrum.ieee.org/semiconductors/design/the-mysterious-memristor
>>
>> >and I'm trying to make heads or tails of them. If they came in 0805
>> >packages and you could buy them from digi-key, how would you spec
>> >them? They say it has the units of ohms but if its a constant its just
>> >a resistor, so you can't spec a 3 ohm memristor. Can you spec a 3
>> >Weber/coulomb memristor? Doing unit analysis on the equations
>>
>> >R = dv/di , C = dq/dv, L = dphi/di, M = dphi/dq, V = dphi/dt, =
>I = dq/
>> >dt
>>
>> >I get
>> >RC = M/L = idt/di has units of time
>> >L/R = CM = vdt/dv has units of time
>> >LC = (idt)(vdt)/(dvdi) has units of time squared
>> >R/M (idtdv)/(vdtdi) is unit less
>>
>> >Does this thing break traditional circuit analysis?
>>
>> I did a read very simple explanation:
>> The electrical current moves some atoms in a grid.
>> that changes the resistance permanently.
>> Reversing the current moves the atoms back.
>> This can be done very fast (much faster then programming FLASH).
>> I am sure that the chips that will be marketed will have a controller bui=
>ld in,
>> and you will just be able to interface with it in the usual way.
>
>Yes, I can see it as something exotic in an IC. But I just don't see
>it as a fundamental circuit component like resistors, capacitors and
>inductors. If I had a circuit with one in it I wouldn't know how to
>solve it. Heck I can't even figure out what value to give it.

If it is at the atomic level, perhaps some QED effects may come into play.
That is way beyond what I have learned, but looking at it from the mechanical
explanation I think you will see R change after some I is applied.
Probably some minimum I is needed to cause the effect, and a lower I to read it?
Nothing 'fundamentally' new, just marketing hype.
But it is a new type of memory for sure.
If they can make that density that they mention then we have a nice part to play with.
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