![]() It is because of the gate to source junction due to avalanche effect.In this region, the drain current increases rapidly as the drain to source voltage is increased. The drain current in the pinch off region depends upon the gate to source voltage and is given by the relation.In this drain current remains constant at its maximum value I dss.To use FET as an amplifier it is operated in this saturation region. ![]() Because of the channel is occupied with depletion region, the depletion region is more towards the drain and less towards the source, so the channel is limited, with this only limited number of carriers are only allowed to cross this channel from source drain causing a current that is constant in this region. It is also called as saturation region or constant current region. ![]()
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