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