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  • hi,

    When we compute the pinch off voltage for an n channel JFET, we always do it by keeping Vgs = 0 and then the value of Vds for which the channel conductivity ceases is noted. Now when we try to find out the cut-off voltage Vgs(off) it is the gate source voltage for which the channel ceases its conduction. My question is do we keep Vds = 0 during the calculation of cut-off voltage.
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  • Jeffrey Arulraj

    Member • Oct 10, 2013

    Your first statement is not correct
    proffy
    When we compute the pinch off voltage for an n channel JFET, we always do it by keeping Vgs = 0 and then the value of Vds for which the channel conductivity ceases is noted.
    Here we keep a constant Vgs through out the testing process without changing it

    It may not be zero at any time.

    This will make the next part easier for

    You just need to keep a constant Vds through out the test to calculate the Vgs at which you have the needed solution
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