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The depletion layer of tunnel diode is very small beacause______

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The depletion layer of tunnel diode is very small beacause______

(a) its abrupt and has high dopants

(b) uses positive conductance property

(c) its used for high frequency ranges

(d) tunneling effect

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My query is from Tunnel Diodes and its Characteristics in portion Semiconductor-Diode Characteristics of Electronic Devices & Circuits

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The correct choice is (a) its abrupt and has high dopants

Easy explanation: When the P and N regions are very highly doped, the depletion layer comes closer. The tunnel diode is also highly doped. Its doping concentration varies within a small scale. So it’s an abrupt diode. For these reasons, the depletion region is small.

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