Q. Give reasons for the following:

1. FET is called as a square law device**
2. Barkhausens criteria should be satisfied to get oscillations.

1.We know that the expression for drain current of a JFET is as follows:

$\hspace {1cm} I_D = I_{DSS} \bigg[\frac{1-V_{GS}}{V_P}\bigg]^2$

This shows that $I_D$ ids proportional to square of VGS which is the controlling input parameters due to this square relationship between ID and VGS, the FET is called as …