what is square law device? what is the function of this?
Please suggest me any me hurry up!
i am wating your reply?
A square law device is something where either current or voltage depends on the square of the other quantity.!
For e.g: for a saturated MOSFET current(I) is directly prooportional to square of voltage(V2).
A diode characteristics also has a square but its not as clean.It's exponential and through a taylor series we get a linear, square ir cubic terms...
but anyway its useful bcoz it can b used as a modulator or mixer.
adding voltage is easy but multiplying them is hard..with a square law device like MOSFET it could b done easily.!
I proportional to(P.T) V2
I P.T (sin(wct) + m(t))2
I P.T (sin(wct))2 + m(t)2 + m(t)sin(wct).
Now if we follow it with just bandpass filter on wc we get simply m(t)sin(wct).