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Old Jun 1st 2008, 07:39 PM   #1
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Thermal Logic Gates

Thermal Logic Gates
Information processing in the world's computers is mostly carried out in compact electronic devices, which use the flow of electrons both to carry and control information. There are, however, other potential information carriers, such as photons, which are parcels of light. Indeed a major industry, photonics, has developed around the sending of messages encoded in pulsed light.
Heat pulses, or phonons, rippling through a crystal might also become a major carrier, says Baowen Li of the National University of Singapore (phylibw@nus.edu.sg). Li, with his colleague Lei Wang, have now shown how circuitry could use heat---energy already present in abundance in electronic devices---to carry and process information.
They suggest that thermal transistors (also proposed by Li's group in Applied Physics Letters, 3 April 2006) could be combined into all the type of logic gates---such as OR, AND, NOT, etc.-used in conventional processors and that therefore a thermal computer, one that manipulates heat on the microscopic level, should be possible.
Given the fact that a solid state thermal rectifier has been demonstrated experimentally in nanotubes by a group at UC Berkeley (Chang et al., Science, 17 November 2006) only a few years after the theoretical proposal of "thermal diode," the heat analog of an electrical diode which would oblige heat to flow preferentially in one direction (Li et al, Physical Review Letters, 29 October 2004). Li is confident that thermal devices can be successfully realized in the foreseeable future.




source:http://www.aip.org/pnu/2007/split/840-2.html

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Old Jun 1st 2008, 07:41 PM   #2
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I only know that electrical diode allows current to flow in one direction(rectifying property), however, what's the principle behind?

What is the difference between "thermal diode" and "electrical diode" ? It is only differs in terms of ways of carrying information?(speechless)

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Old Nov 12th 2009, 02:36 AM   #3
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Hi,
i don't know much more about this! But i think the logic feature is designing your transistor circuit to conduct based on your desired logic. Typical logic types are AND, NAND, OR, NOR, XOR, etc. A logic gate that is designed to only perform when both and only both inputs are TRUE (high) is an AND gate.

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Old Nov 12th 2009, 05:28 AM   #4
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Maybe it allows heat flow only in one direction?
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Old Nov 12th 2009, 10:40 PM   #5
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Maybe, it's really interesting.
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Old Nov 13th 2009, 12:24 AM   #6
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From what little we know it looks that such systems cant be very fast and also they look very temperature dependent.

For example if we require a "heat pulse" to go from left to right and due to extraneous reasons the right side temperature goes very high. Then it looks like the thermal diode wont function as expected, whereas for a semiconductor diode this wouldn't be a problem.
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Old Nov 13th 2009, 02:17 AM   #7
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Thanks again werehek. I managed to register and look up the article. It is interesting. They dont seem to be considering it as an alternative to semiconductor based logic. However, they mention applications which could be something like walls etc with unidirectional heat flow.

I cant help thinking of the energy savings in heating that can ensue if they can make it commercial.
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Old Aug 3rd 2015, 11:21 PM   #8
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Logic gates are the basic digital elements of the computer. We build a thermal logic gates that can perform similar operations to their electronic counterparts.
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Old Apr 11th 2016, 01:17 AM   #9
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The thermal logic gates are based on the nonlinear lattices, which exhibit very intriguing phenomena due to their temperature dependent power spectra.
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Old Mar 12th 2017, 12:38 PM   #10
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A logic gate implements a Boolean function and thus performs a logical operation on one or several logic inputs in order to produce a single logic output. A logic gate often uses diodes or transistors that act like electronic switches. Electronic logic gates differ from their relay-and-switch equivalents because they consume less power and are much faster and smaller. Also, contrary to a switch circuit, it is not possible for current to flow between the input and the output of a semiconductor logic gate. This is because a semiconductor logic gate acts as a high-gain voltage amplifier which sinks a tiny current at its input and produces a low-impedance voltage at its output. Another advantage of integrated circuit logic families is that they can be cascaded. The output of one gate can be wired to the inputs of one or more other gates.
Types of Logic gates

There are several different kinds of programmable logic gates at Future Electronics. We stock many of the most common types categorized by several parameters including family, logic circuit, number of functions, output characteristics, nominal supply voltage and packaging type. Our parametric filters will allow you to refine your search results according to the required specifications.
Logic gates from Future Electronics

Future Electronics has a wide range of programmable logic gates from several chip manufacturers that can be used for programming your circuits. By going through the selection you will find the right digital logic gate, AND gate, OR gate, CMOS logic gate, NOT gate, XOR gate, NOR gate, NAND gate, universal logic gate, electronic logic gate, transistor logic gate or chips for any type of circuit or IC that might require logic gates. Once you decide if you need a dual gate, quad gate, single gate of triple gate, you will be able to choose from their technical attributes and your search results will be narrowed to match your specific logic gate application needs.
We deal with several manufacturers such as Fairchild, Diodes Inc., NXP, ON Semiconductor or STMicroelectronics, among others. You can easily refine your logic gate product search results by clicking your preferred logic gate brand from the list of manufacturers below.
Applications for Logic Gates:

Logic circuits are found in several devices including multiplexers, arithmetic logic units, computer memory and registers. They are also used in microprocessors, some of which can contain over 100 million gates. Also, logic gates are the building blocks of digital electronics and are formed by the combination of transistors in order to realize some digital operations. Every digital product, including personal computers, mobile phones, tablets, calculators and digital watches also uses logic gates.
Choosing the Right Logic Gate:

With the FutureElectronics.com parametric search, when looking for the right logic gates, you can filter the results by category. We carry the following categories of logic gates:
Dual Gate
Quad Gate
Single Gate
Triple Gate
Once you choose the logic gate category, you can narrow them down by various attributes: by logic circuit, number of functions and nominal supply voltage to name a few. You will be able to find the right logic gate chip that can be used for programming your circuits such as a digital logic gate, CMOS logic gate, NOT gate, AND gate, OR gate, NAND gate, XOR gate, NOR gate, universal logic gate, electronic logic gate, transistor logic gate or chips for any type of IC or circuit that might require logic gates by using these filters.
Logic Gates in Production Ready Packaging or R&D Quantities

If the quantity of logic gates you require is less than a full reel, we offer to our customers several of our programmable logic gates in tray, tube or individual quantities that will help you avoid unneeded surplus.
Future Electronics also offers its clients a unique bonded inventory program designed to eliminate potential problems that may arise from an unpredictable supply of products that could contain raw metals and products with erratic or long lead times. Talk with your nearest Future Electronics branch and find out more on how you and your company can avoid possible shortages.
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