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?
"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
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.
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?
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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
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...
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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
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.
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