For fabricating n-channel FET, first a narrow bar of n type semiconductor material is taken and then two pn juntions are diffused on opposite sides of its middle part. Write any two differences between JFET and BJT.ĭescribe briefly the construction of n-channel JFET.įET can be fabricated with either n-channel or p-channel. Gate controls the flow of charge carriers through the channel.ĭraw the symbols of n-channel and p-channel JFET. MOSFET= Metal oxide semiconductor Field Effect Transistor.ĭraw the circuit symbol of n-channel FET and name the terminals.ĭrain collects the charge carriers supplied by the source. 2nd PUC Electronics Field Effect Transistor (FET) Two Marks Questions and Answers Write any one characteristic feature of FET.įET is voltage controlled device. I DSS is the drian to source saturation current. Write the relation between p, r d, and g m. It is the ratio of change in drain to source voltage V DS to a corresponding change in gate to source voltage V GS for constant drain current I D. It is the ratio of change in drain current I D to the corresponding change in gate to source voltage V GS for a constant drain to source voltage V DS. The drain resistance is the ratio of drain to source voltage V DS to the drain current I D for a constant value of gate to source voltage V GS. These are the set of curves drawn for the relationship between drain current (I D) and gate to source voltage (V GS) at a constant drain to source voltage (V DS). What is the value of drain current at pinch off condition?ĭrain characteristics is set of curves drawn for the relationship between drain current (I D)Īnd drain to source voltage (V DS) at a constant gate to source voltage (V GS). The negitive gate voltage at which drain current becomes zero. Which is the type of potential usually applied to the gate terminal? Source supplies charge carriers for conduction.ĭrain collects the charge carriers supplied by the source. Name the charge carriers that are responsible for the conduction of current in p-channel JFET. Name the charge carriers that are responsible for the conduction of current in a n-channel JFET? Is FET a unipolar device or bipolar device? Gate controls the flow of charge carriers through the channel. How many pn junctions are present in JFET? P channel FET has p type semiconductor bar with two n type heavily doped regions diffused on opposite sides. In channel FET has n type semiconductor bar with two p type heavily doped regions diffused on opposite sides. Metal oxide semiconductor Field Effect Transistor. Metal oxide semiconductor field effect transistor (MOSFET) or Insulated gate field effect transistor (IGFET).Junction field effect transistor (JFET).Is FET a current controlled device or a voltage controlled device?
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