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Q. Explain shockly's equation and its significance in plotting the transfer characteristics ?
The linear relationship does not exists in the output of the JFET, the relationship is given by the shockley's equation.
ID = IDSS(1-VGS/VP)2
where ID ----> drain current at the given value of VGS.
IDSS ----> drain source saturation current.
VGS ----> gate source voltage.
VP----> pinch off voltage.
Significance:-
The squared term of the equation will result in the no linear relationship between ID and VGS, producing the graph shown below.
For the dc analysis to be performed , a graphical manner rather than mathematical approach will in general be more direct. The solution is defined by the point of intersection of VDS =0 V and ID axis. The transfer characteristics employed by shockley's equation are unaffected by the network in which the device is employed. The transfer characteristics are a plot of the output current versus an input-controlling quantity. There is therefore a direct transfer from input to the output variables when employing the curve.
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