GunnDiode.ppt (Size: 1.95 MB / Downloads: 213)
-What is Gunn Diode?
The Gunn diode is used as local oscillator covering the microwave frequency range of 1 to 100GHz
-How Gunn Diode works?
By means of the transferred electron mechanism, it has the negative resistance characteristic
-What’s the applications?
Local Oscillator and Avoid Collision Radar instead of Klystron etc..
-What’s the advantages?
Low noise, High frequency operation and Medium RF Power
Gunn effect was discovered by J.B Gunn in IBM : 1963
“Above some critical voltage, corresponding to an electric field of
2000~4000 V/cm, the current in every spectrum (GaAs) became a
fluctuating function of time”
The current waveform was produced by applying a voltage pulse of 59V
And 10ns duration
Oscillation frequency was 4.5Ghz
The period of oscillation is equal to the transit time of electrons through the device