Question

A trapatt has doping concentration 2.5*10^16 cm^3 and current density 33 kA/cm^2. Calculate the avalanche zone velocity.​

Answer 1

Answer:

Concept.

The avalanche zone velocity of a TRAPATT diode is given by:

Vs=dx/dt =J/qNa

J = Current Density

q = Electron charge = 1.6 × 10-19 C

NA = Doping Concentration in cm-3

Calculation:

Given, Doping concentration (NA) = 2 × 1015cm−3 and

Current density (J) = 20 KA/cm2

Vs=20*10power3/1.6*10power-19*2*10power15 cm/s

Vs=6.25*10power7 cm/s