Diode and quadratic region

[profeta64]

Hi guys,

I am curious about the definition of the quadratic region of diodes...
If I consider the Schottky equation, it is exponential...

Then, from where is coming out the expression "quadratic region"?
Thanks a lot

 

[FvM]

The term describes the input versus output voltage characteristic of RF detectors in a specific level range. See e.g. this old HP application note http://www.hp.woodshot.com/hprfhelp/4_downld/lit/diodelit/an986.pdf