![]() This value of V GS is called the Pinch off voltage (V P).Īs V DS appears along the channel length, voltage rises along the channel from source to drain. As value of V GS is increased in negative direction, depletion layer gets widened until it occupies the whole channel. Because of small value of V DS, the depletion layer is uniform and the device acts as a voltage variable resistance. Thus, channel resistance is increased and i d decreases for a given value of V DS. If a negative gate to source voltage is applied, the depletion layer of the gate channel junction widens and channel becomes narrow. With V GS=0 applied voltage V DS causes a current to pass through from drain to source terminals. Junction Field Effect Transistor (JFET) Symbol: Correspondingly, when a JFET have a p-type channel, if a positive voltage is applied to the gate with respect to the source the current becomes reduced. In the n-type, when the voltage source is connected to the gate is -ve with respect to the source, the current decreases. Junction Field Effect Transistor (JFET) is usually two types as it is used n-type or p-type channel as per working. A Junction Field Effect Transistor is usually said to be on when there is no voltage between the gate and the source pin. The channel gets drained and the electric current becomes switched off. JFET is a voltage-controlled device as it is controlled by use of a reverse bias voltage to the gate terminal. ![]()
0 Comments
Leave a Reply. |