What is tunnel diode ?

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A tunnel diode is a pn junction that exhibits negative resistance between two values of forward voltage(i.e between peak point voltage and valley point voltage). A conventional diode exhibits positive resistance when it is forward biased or reverse biased. However, if a Semiconductor junction diode is heavily doped with impurities, it exhibits negative resistance (i.e current decreases as the voltage is increased) in certain regions in the forward direction. Such a diode is called tunnel diode.

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