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The family of FET devices may be divided into :
Junction FETs (JFETs)
Basic Structure of FETs
N - Channel JFET
How JFET Function
Typical ID vs VDs characteristics of a JFET for various fixed gate voltages VGS.
JFET: I-V characteristics
The transconductance curve
JFET drain curves
JFET Biasing Circuits
The method used to plot the dc bias line for the voltage-divider bias is as follows:
1. Plot the transconductance curve for the specific JFET.
5. Plot ID found in (4) on the y-axis.
6. Extend the line to intersect the transconductance curve to obtain the Q- pomt values.
Example: Plot the dc bias line for the voltagedrivers biasing circuit