Compare series, shunt, and chopper type JFET switch.
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Saturation Region (VDS > VGS – VP )
This region starts from the point where VDS is greater than VGS minus VP, here VP is the pinch-off voltage. In this region, the drain current ID entirely depends on the VGS and not a function of VDS. The FET operates in this region to amplify the signals as well as for switching operations. From the figure it is observed that when VGS is zero, the maximum current ID flows. When we change the VGS more negative, then, the drain current is falling. At a particular value of VGS the drain current flows constantly through the device. Hence, this region is also called constant current region.
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