how transistor work in unlinear statues and as demodulator

Hello
how transistor work in unlinear statues and as demodulator?Theory and practical?

books or any reference that know more

Thanks

http://edn.com/design/other/4312213/...ol-frequencies

http://rfic.eecs.berkeley.edu/142/pdf/lect20.pdf

Cheers...

Hello and Thanks
i need more and more and also complete reference

This is a good guide

http://csus-dspace.calstate.edu/bits...pdf?sequence=3

hope it helps

Dear baby_1
Hi
What is unclear for you ? each transistor has a simple input curve . it is an exponential curve . if you break it's linear region ( in fact it is alike linear , but not completely linear . ) then you'll have logarithmic region .
Best Wishes
Goldsmith

Dear goldsmith
as you know transistor az a modulator and demodulator works in Un linear mode.so in university we read complete about linear mode not un linear region that transistor work.i see a lots of book that cover RF design but didn't tell me what exactly transistor do in un linear mode and how transistor works and how can design them in these mode.

Hi Baby_1,

If you want the proper knowledge about the transistor charactersitics you are saying....Please put the charactersitics curve that you are saying on the forum....So that one can give you proper information on that.....it is very tuff to catch what did you mean by un-linear region of transistor....In a sense you are talking the saturation region or active region of the charactersitics of the transistors....

Hi baby-1
Are you familiar with input curve of a transistor or transfer curve of a diode , really ? if you have read about them at past , thus you should be able to drive your transistor in un linear region .
At start point ( 0.4 volts ) a transistor will start to conduct . but this region is pretty logarithmic . and at 0.6 it's conductance will be as high as possible . so after 0.6 it's behavior is alike with a linear function . but before it , it is pretty logarithmic .
Good luck
Goldsmith

A nonlinear behaviour can be represented with well known mathematical functions such as sin,cos,exponential.
If you examine carefully a nonlinear behaviour of an active device, you will understand how this component will act as modulator or demodulator.
Check trigonometric equations and identities...