Multiple choice

A region of negative differential resistance is observed in the current voltage characteristics of a silicon PN junction if

  1. both the P-region and N-region are heavily doped

  2. the N-region is heavily doped compared to the P-region

  3. the P-region is heavily doped compared to the N-region

  4. an intrinsic silicon region is inserted between the P-region and the N-region
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A Correct answer
Explanation

In case of tunnel diode formed by PN junction, tunnel diode gives negative resistance and works in forward bias. In a tunnel diode, both N and P regions are heavily doped.

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