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Juhi

There are DE MOSFETs and E MOSFETs. The mode is how you bias them. The bias voltage on a DE MOSFET P channel and N channel are inverse.With a JFET, it\'s different. You are always reverse biased. So it\'s only the bias that determines what mode you are in. If you you bias the N channel positive, you are in enhancement. If you bias it negative you are in depletion. Either way, the operation of increasing conductivity or decresing conductivity is the same. I think there is something about 0VGS that is sort of a demarcation between the two modes. In enhancement mode, a channel has to be induced. Increasing V-GS (voltage b/w gate and source) above the threshold voltage Vt enhances the channel, hence the name enhancement-mode operation and enhancement-type MOSFET. Then applying V-DS (voltage b/w drain and source) causes the drain current to flow. Depletion-type MOSFET has an implanted channel. Thus if we apply V-DS, the drain current will flow for V-GS = 0