Impatt and Gunn Diodes

I'm studying a microwave oscillator [who is based on the negative resistance principle]. It use an Impatt Diode. I ask if You have some theory and application document about Impatt and Gunn diodes. Thanx for Your Collaboration.

Hello Paolone1340;
I recommend the book written by Yngvesson about microwave semiconductor devices. Also you may see some materials in the book written by Sze about physics of semiconductor devices.
No one

Physics of Semiconductor Devices, S.M. Sze, 3rd edition:
h**p://www.edaboard.com/ftopic214298.html

It has been a coon's age, but as I recall the use of something called a Reike (or Rieke) diagram explained the circuit impedances needed for proper operation.