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Thread: Quantum Diode ( Tunneling Diode )

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    tom
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    Default Quantum Diode ( Tunneling Diode )

    Can someone explain what a Quantum Diode ( Tunneling Diode ) is and how it works?

    I believe someone won the Nobel Prize back in the 50s for this and it was used by Sony. I tried wikipedia but they dont get into the HOW it works part as much.

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    Default Re: Quantum Diode ( Tunneling Diode )

    Quote Originally Posted by tom View Post
    Can someone explain what a Quantum Diode ( Tunneling Diode ) is and how it works?

    I believe someone won the Nobel Prize back in the 50s for this and it was used by Sony. I tried wikipedia but they dont get into the HOW it works part as much.
    Try the Wikipedia article. There it claims that credit for inventing it is given to Leo Esaki, who did in fact won the Nobel prize for inventing (a fact I did not know until you brought it up). Anyway, thanks for posting this: it brought back memories from my Army times where the tunnel diode was used in radars as the key component for parametric amplifiers.
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    Default Re: Quantum Diode ( Tunneling Diode )

    I re-read the wikipedia and still it doesnt make sense as to the how it works. Any details?

    Quote Originally Posted by kg4pae View Post
    Try the Wikipedia article. There it claims that credit for inventing it is given to Leo Esaki, who did in fact won the Nobel prize for inventing (a fact I did not know until you brought it up). Anyway, thanks for posting this: it brought back memories from my Army times where the tunnel diode was used in radars as the key component for parametric amplifiers.

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    Default Re: Quantum Diode ( Tunneling Diode )

    Are you asking how tunneling works?

    A common analogy to explain goes like this.

    Imagine a wave of amplitude 1 foot strikes a sea wall a foot and a half high. Obviously the wave can't go over the wall. However if the wave encounters a slope under the water to the wall it will increase in amplitude and crest over the wall.

    The bottom effect in terms of electromagnetic waves can be understood as a refraction effect. In quantum terms (which I don't buy or recommend) it's tunneling. Ie going through something it doesn't ordinarily have the "amplitude" to go through.
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    Default Re: Quantum Diode ( Tunneling Diode )

    I understand the tunneling ... just asking how the tunneling diode works.

    Quote Originally Posted by astrotech View Post
    Are you asking how tunneling works?

    A common analogy to explain goes like this.

    Imagine a wave of amplitude 1 foot strikes a sea wall a foot and a half high. Obviously the wave can't go over the wall. However if the wave encounters a slope under the water to the wall it will increase in amplitude and crest over the wall.

    The bottom effect in terms of electromagnetic waves can be understood as a refraction effect. In quantum terms (which I don't buy or recommend) it's tunneling. Ie going through something it doesn't ordinarily have the "amplitude" to go through.

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    Default Re: Quantum Diode ( Tunneling Diode )

    Quote Originally Posted by tom View Post
    I understand the tunneling ... just asking how the tunneling diode works.
    Do you understand what a diode does? Do you understand what a transistor does and how it works? If you do you should be able to figure it out yourself. If not You'll have to learn those.

    Basicly the tunneling diode increases the discrimitation of signal proccessing. Doping the signal plate of the transistor changes its activation potential.

    I think.
    Last edited by astrotech; 10-30-2015 at 12:14 PM.
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    Default Re: Quantum Diode ( Tunneling Diode )

    Quote Originally Posted by astrotech View Post
    Do you understand what a diode does? Do you understand what a transistor does and how it works? If you do you should be able to figure it out yourself. If not You'll have to learn those.

    Basicly the tunneling diode increases the discrimitation of signal proccessing. Doping the signal plate of the transistor changes its activation potential.

    I think.
    Close.

    "At very large reverse bias, beyond the peak inverse voltage or PIV, a process called reverse breakdown occurs that causes a large increase in current (i.e., a large number of electrons and holes are created at, and move away from the pn junction) that usually damages the device permanently. The avalanche diode is deliberately designed for use in that manner. In the Zener diode, the concept of PIV is not applicable. A Zener diode contains a heavily doped pn junction allowing electrons to tunnel from the valence band of the p-type material to the conduction band of the n-type material, such that the reverse voltage is "clamped" to a known value (called the Zener voltage), and avalanche does not occur. Both devices, however, do have a limit to the maximum current and power they can withstand in the clamped reverse-voltage region. Also, following the end of forward conduction in any diode, there is reverse current for a short time. The device does not attain its full blocking capability until the reverse current ceases." - Source
    My oath of office never expires. "God, who gave us life, gave us liberty. Can the liberties of a nation be secure when we have removed a conviction that these liberties are the gift of God?" - Thomas Jefferson. "I have far too long suffered fools. No longer will I tolerate the insufferable. Enjoy the vacuum." - Mugs

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