How tunnel diode is different from ordinary pn junction diode explain its VI characteristics with proper biasing?

Unlike the normal p-n junction diode, the width of a depletion layer in tunnel diode is extremely narrow. So applying a small voltage is enough to produce electric current in tunnel diode. Tunnel diodes are capable of remaining stable for a long duration of time than the ordinary p-n junction diodes.

What is the principle of tunnel diode?

Tunnel diode

Type Passive
Working principle Quantum mechanical effect called tunneling
Invented Leo Esaki Yuriko Kurose Takashi Suzuki
First production Sony
Electronic symbol

What is the key characteristics of a tunnel diode?

Tunnel diode theory basics The key to understanding tunnel diode theory is the characteristic curve in which there is a negative slope – this indicates an area of negative resistance. An area of negative resistance means that if the voltage is increased, the current actually falls – the opposite to Ohms Law.

What is tunnel diode and its characteristics?

A Tunnel diode is a heavily doped p-n junction diode which displays a negative resistance behaviour in a specific region in its characteristic curve. By Negative resistance we mean that in that region, the current flowing through the diode decreases as the voltage is increased.

What is a PN junction explain VI characteristics of a pn junction?

VI characteristics of PN junction diodes is a curve between the voltage and current through the circuit. Voltage is taken along the x-axis while the current is taken along the y-axis. The above graph is the VI characteristics curve of the PN junction diode.

What are the differences between a tunnel diode and an ordinary pn junction diode?

Tunnel diode is a highly doped semiconductor diode. The p-type and n-type semiconductor is heavily doped in a tunnel diode due to a greater number of impurities. Heavy doping results in a narrow depletion region. When compared to a normal p-n junction diode, tunnel diode has a narrow depletion width.

What is tunneling explain voltage current characteristics of a tunnel diode with the help of energy band diagram?

Tunnel Diode Working The holes and electrons energy levels within the P-type & N-type remain the same correspondingly. When the applied voltage increases then both the bands will overlap and the energy levels at both bands in two regions will be equal. Therefore, the highest current flows through the tunnel.

How tunnel diode is different from backward diode?

The backward diode is a special form of tunnel diode in which the tunneling phenomenon is only incipient, and the negative resistance region virtually disappears. The forward current is very small and becomes equivalent to the reverse current of a conventional diode.

What is the key characteristic of a tunnel diode?

What are the advantages of tunnel diode?

Advantages of Tunnel Diode

  • Low cost.
  • Low noise.
  • Ease of operation.
  • High speed.
  • Low power.
  • Insensitive to nuclear radiations.

What is advantage and disadvantage of tunnel diode?

Being two terminal device, it provides no isolation between output and input circuit. The power output levels of tunnel diode are restricted to only a few milliwatts because the applied DC potential must be less than bandgap potential of the diode.

Why is it called tunnel diode?

The name “tunnel diode” is due to the quantum mechanical tunneling is responsible for the phenomenon that occurs within the diode. The doping is very high so at absolute zero temperature the Fermi levels lies within the bias of the semiconductors.