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To find the drain-source saturation current (IDSS) from the characteristics curves of a JFET, locate the transfer characteristic curve, which plots the drain current (ID) against the gate-source voltage (VGS). IDSS is identified as the maximum drain current occurring when VGS equals zero (VGS = 0V). This point corresponds to the intersection of the ID curve with the vertical axis (ID axis) on the graph. Reading the value at this point gives you the IDSS for the JFET.

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How do you find VGS in JFET?

To find the gate-source voltage (VGS) in a Junction Field Effect Transistor (JFET), you can measure the voltage difference between the gate and the source terminals. In a typical configuration, the gate is reverse-biased, meaning it is at a lower potential than the source. If you know the source voltage (VS) and the gate voltage (VG), you can calculate VGS using the formula: VGS = VG - VS.


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2 What is Pinch-off voltage of JFET?

To find out the qualitative response to changes in Vgs and Vds, consider Vgs =0. In response to a small applied voltage Vds, a n-channel JFET acts as a simple semiconductor resistor and Id increases linearly with Vds. With increasing current, the ohmic voltage drop between the source and the channel region reverse biases the junction and the conducting portion of the channel begins to constrict. because of the ohmic drop along the length of the channel itself, the constriction is not uniform but is more pronounced at distances father from the source. Eventually, a Vds is reached at which the channel is "pinched off". At this voltage, Id begins to level off. and approach a constant value. It is not possible for the channel to close completely and reduce Id to zero. If that were the case, then the ohmic drop required to provide the back biasing would be lacking.Id is not equal to zero at Pinch off voltage.Thus, pinch off voltage can be defined as the gate reverse voltage that removes all the free charge from the channel.


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How do you find VGS in JFET?

To find the gate-source voltage (VGS) in a Junction Field Effect Transistor (JFET), you can measure the voltage difference between the gate and the source terminals. In a typical configuration, the gate is reverse-biased, meaning it is at a lower potential than the source. If you know the source voltage (VS) and the gate voltage (VG), you can calculate VGS using the formula: VGS = VG - VS.


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