JFETs and DE-MOSFETs are classified as the depletion-mode devices because their conductivity depends on the action of depletion layers.
E-MOSFET is classified as an enhancement-mode device because its conductivity depends on the action of the inversion layer.
Depletion-mode devices are normally ON when the gate-source voltage V is controlled by the gate voltage.
The characteristic curves have almost vertical and almost horizontal parts.
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