Accurate Voltage on a Capacitor

[Kuan Zhou]

Hi,

We designed a circuit model that can maintain an accurate analog
voltage on the capacitor through the positive feedback. Whever there is a
current input to the current source, the analog voltage will
increase/descrease correspondingly and this analog voltage can be maintained
for several days with no attenuation. The initial purpose of this circuit is
to emulate the brain working memory. We are wondering now what are the
potential engineering applications for such circuits. Can any guys give us
some suggestions?

Kuan

 

[[email protected]]

Hi,

We designed a circuit model that can maintain an accurate analog
voltage on the capacitor through the positive feedback. Whever there is a
current input to the current source, the analog voltage will
increase/descrease correspondingly and this analog voltage can be maintained
for several days with no attenuation. The initial purpose of this circuit is
to emulate the brain working memory. We are wondering now what are the
potential engineering applications for such circuits. Can any guys give us
some suggestions?

Kuan

If you ever build a time machine, you'll have a great circuit for 1959.

 

[D from BC]

Hi,

We designed a circuit model that can maintain an accurate analog
voltage on the capacitor through the positive feedback. Whever there is a
current input to the current source, the analog voltage will
increase/descrease correspondingly and this analog voltage can be maintained
for several days with no attenuation. The initial purpose of this circuit is
to emulate the brain working memory. We are wondering now what are the
potential engineering applications for such circuits. Can any guys give us
some suggestions?

Kuan

Sounds like a transconductance amp + sample and hold.


D from BC
British Columbia
Canada.

 

[Robert Baer]

Sounds like a transconductance amp + sample and hold.


D from BC
British Columbia
Canada.

"A few days" ... reminds me of some Intel PMOS RAM that required 3
voltages..once programmed, power off, unplugged, they could reliably
hold data for days.

 

[D from BC]

"A few days" ... reminds me of some Intel PMOS RAM that required 3
voltages..once programmed, power off, unplugged, they could reliably
hold data for days.

I'm still thinking about brain function..
The brain stores in terms of varying levels??? Kinda cool..
Lots of people are probably assuming the brain is like a computer with
1's and 0's.


D from BC
British Columbia
Canada.

 

[John Popelish]

I'm still thinking about brain function..
The brain stores in terms of varying levels??? Kinda cool..
Lots of people are probably assuming the brain is like a computer with
1's and 0's.

The way I have heard it, things are learned by the
production or elimination of synapses, that alter the
interconnections of neurons and that way, vary the way they
trigger each other. Think old plug-board programming a la
ENIAC.

http://en.wikipedia.org/wiki/ENIAC

 

[Tim Williams]

Lots of people are probably assuming the brain is like a computer with
1's and 0's.

Nah nah, base e. 0, 1, 2, ... 10(e) ~= 2.7182818284590 (dec). ;-)

Incidentially, Pi (base e) ~= 10.1010020200021.

Tim

 

[BobW]

Nah nah, base e. 0, 1, 2, ... 10(e) ~= 2.7182818284590 (dec). ;-)

Incidentially, Pi (base e) ~= 10.1010020200021.

Tim

That's good to know, but it still doesn't explain the universal significance
of the number 42.

Bob

 

[Tim Williams]

That's good to know, but it still doesn't explain the universal significance
of the number 42.

42 (dec) = 2001.20121000000 (e)

Hm, I'm sure there are more digits, but that's all of it i've got. Kinda
funny that it's 2001 though.

Tim

 

[Tim Williams]

That's good to know, but it still doesn't explain the universal significance
of the number 42.

42 (dec) = 2001.20121000000 (e)

Hm, I'm sure there are more digits, but that's all of it i've got. Kinda
funny that it's 2001 though.

Tim

 

[Tim Williams]

That's good to know, but it still doesn't explain the universal significance
of the number 42.

42 (dec) = 2001.20121000000 (e)

Hm, I'm sure there are more digits, but that's all of it i've got. Kinda
funny that it's 2001 though.

Tim

 

[Michael A. Terrell]

That's good to know, but it still doesn't explain the universal significance
of the number 42.

See? That's what's wrong with dimbulb. He always comes up with
666...


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Michael A. Terrell]

Hi,

We designed a circuit model that can maintain an accurate analog
voltage on the capacitor through the positive feedback. Whever there is
a
current input to the current source, the analog voltage will
increase/descrease correspondingly and this analog voltage can be
maintained
for several days with no attenuation. The initial purpose of this
circuit is
to emulate the brain working memory. We are wondering now what are the
potential engineering applications for such circuits. Can any guys give
us
some suggestions?

Kuan

There is no such accurate voltage at a capacitor, the charge varies on
capacitance and current you supply dummy. Whatsamatta with you Chinese?
Can't you figure it out on your own?


--
Service to my evil master? Been there, Done that, and I've got my DD666 to
prove it.
Member of DAV #666.

Michael A. Terrell
Central Florida

 

[Michael A. Terrell]

42 (dec) = 2001.20121000000 (e)

Hm, I'm sure there are more digits, but that's all of it i've got.
Kinda
funny that it's 2001 though.

Tim

ONLY A DUMBASS PUTS 00000 AFTER A DECIMAL NUMBERS, AND WORSE THAN THAT A
Zero E (Exponent with no signification). Goddamn you idiots wasting
natural resources, making Bogus War etc...


--
Service to my evil master? Been there, Done that, and I've got my DD666 to
prove it.
Member of DAV #666.

Michael A. Terrell
Central Florida

 

[Tom Bruhns]

Hi,

We designed a circuit model that can maintain an accurate analog
voltage on the capacitor through the positive feedback. Whever there is a
current input to the current source, the analog voltage will
increase/descrease correspondingly and this analog voltage can be maintained
for several days with no attenuation. The initial purpose of this circuit is
to emulate the brain working memory. We are wondering now what are the
potential engineering applications for such circuits. Can any guys give us
some suggestions?

Kuan

Hello,

How large a capacitor? That is to say, what is the effective leakage
current? We have operational amplifiers with input bias currents on
the order of 10^-14 amps readily available and rather inexpensive, and
certain capacitors I've tested have extremely long self-discharge time
constants, so that the primary errors within a week's time are
capacitance variation with temperature and dielectric absorption
effects. I'm wondering if your circuit provides advantages beyond
that.

These days, it is quite possible to accomplish the function digitally
with essentially zero droop rate; the only problems are component
failure and perhaps external "noise" such as gamma rays or severe
electromagnetic pulses that disrupt the circuit.

Many years ago, when the first inertial navigation systems were
developed, making integrators with very low drift rate was a big
deal. Now, I don't think it is, at least not at the "days" level.
"Years" or "decades" may be interesting.

Others who have posted to this thread mentioned buried FET gates that
can be charged and will then hold their charge for many years, but I'm
not sure they count, unless there's a mechanism to actually control
the charge on the gate over a continuous range accurately and at will.

Cheers,
Tom

 

[JosephKK]

ONLY A DUMBASS PUTS 00000 AFTER A DECIMAL NUMBERS, AND WORSE THAN THAT A
Zero E (Exponent with no signification). Goddamn you idiots wasting
natural resources, making Bogus War etc...

Crap you are getting really obvious, forger.

 

[Robert Baer]

I'm still thinking about brain function..
The brain stores in terms of varying levels??? Kinda cool..
Lots of people are probably assuming the brain is like a computer with
1's and 0's.


D from BC
British Columbia
Canada.

Varying levels is much more likely: neuron firing levels are adjustable.

 

[Robert Baer]

42 (dec) = 2001.20121000000 (e)

Hm, I'm sure there are more digits, but that's all of it i've got. Kinda
funny that it's 2001 though.

Tim

Makes it sound obsolete...