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  • Basic electronics doubt: What is a bipolar device?

    jvivin1990

    jvivin1990

    @jvivin1990-4rMPzo
    Updated: Oct 26, 2024
    Views: 1.2K
    what is a bipolar device?
    i know that conduction is due to two types of charges but how both + & - can be responsible..i feel that there is some contradiction...one relies on the other.they are inseparable..then how? can u understand my doubt? please clear
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  • skipper

    Member • Oct 2, 2009

    It's called a bipolar device because there are two kinds of differently polarized material elements in the device.
    A bipolar transistor has two main sections which are n-type or p-type semiconductors. A third section is the base which straddles the two main sections. The idea is that the bipolarity is a kind of "stretch" in a membrane (made of charge) which biasing the device changes the size of.

    When a transistor (or a diode) is biased and the bias oscillates, the charge "stretches" and "compresses" inside the device (actually across the junction called the depletion region). This is like stretching and relaxing an elastic membrane, any "particles" on it will bounce around.

    So that, forward-bias gives electrons a kick in a certain direction; if they're in the +ve section of the device they see either a +ve boost (so they stay put) or a -ve boost (which repels them). The base in a transistor "injects" electrons as a signal, which the forward bias "carries". Hence, carrier + signal carried.
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  • Anil Jain

    Member • Oct 6, 2009

    Please refrain yourself from posting this link on all the threads.

    Mods, please check this.
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  • jvivin1990

    Member • Oct 7, 2009

    crazyboy
    Please refrain yourself from posting this link on all the threads.

    Mods, please check this.
    No i dint ! where it is? check out the name who is posting it.. then post your comments
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  • Sriman44

    Member • Feb 15, 2011

    the name "Bipolar" device says about it ..
    bi-two polar device..
    means two polar device + and - are two polars
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  • kelliew

    Member • Feb 18, 2011

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  • d_vipul

    Member • Feb 21, 2011

    hey mod check this link.........
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