With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.

With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.
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1 Answer

Answer :

Working of N channel FET:


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* When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel existing between the depletion regions. 

* This constitutes drain current, ID. 

* The value of drain current is maximum when the external voltage applied between gate and source 0V. 

* When the gate to source voltage (applied by VGG) becomes negative,, the reverse bias voltage across gate source junction is increased. 

* The depletion region is widened. This reduces the width of the channel and thus controls the flow of current. 

* The gate source voltage reaches a point where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage. 

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