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To use FET as a voltage controlled resistor, in which region it should operate?(a) Ohmic region(b) cut off(c) Saturation(d) cut off and saturationI had been asked this question in a national level competition.Question is taken from The Junction Field-Effect Transistor in portion Field-Effect Transistors of Electronic Devices & Circuits

Answer»

Right choice is (a) Ohmic region

Explanation: By VARYING the GATE to source voltage, Resistance can be varied as FOLLOWS rd = RO/(1-Vgs/Vp)^2



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