About gunn diode I-V curve

[yours]

I was making my graduation design:gunn diode vco.But i can not get useful information about gunn diode.I need your help to introduce any book.
One approximate example of gunn diode I-V curve :i=a1*u+a3*u³,however,I can not make sure of it and its parameter.In addtion,I want to get the exact simulation with lumped elements circuit.
Could you give any related datum to me.Thankyou very much.[/u][/i]

 

[vicky]

HI DEAR

CHECK THE ATTACHED FILE IT CONTAINS YOUR REQUIRED DATA

 

[yours]

HI DEAR

CHECK THE ATTACHED FILE IT CONTAINS YOUR REQUIRED DATA

vicky!

I can not help appreciating You for your generousness.Another question as follows:
The gunn diode with certain DC(10V) truns into negative resistor(-R).Then vco start to oscillate
when abs(-R)>RL(load resistor).
The condition of stability is that the positive resistor equals negative resistor in the entire circuit .
The image part of the entire circuit determinates the resonating frequency.
DC determinates the size of negative resistor.
Then how does the vco come to be stable because -R and RL would not change?