Q. Write down Shockley's equation. What is its importance?
ID = IDSS [1-(VGS/VP)]^2
Shockley's equation is used to plot transfer characteristics. The transfer characteristics defined by Shockley's equation are unaffected by the network in which the device is employed.
A linear relation exists between IC and IB. Double the level of IB and IC increase by a factor of two also. But this linear relation does not exist between the output and input quantities of a JFET. The relation between ID and VGS is also given by this equation.