Drain characteristic of FET The curve between drain current I D and drain source voltage V DS of a FET at constant gate source voltage V GS is known as drain or output characteristics of FET. The below fig shows the circuit for determining the output characteristics of FET. Keeping V GS fixed at some value, the drain – source voltage is changed in steps. Corresponding to each value of V DS the drain current I D is noted. A plot of these value gives the output characteristics of FET. Repeating similar procedure, output characteristics at other gate _ source voltage can be drawn. The fig shows a family of output characteristics understand the nature of the drain characteristics. Let us consider the characteristics for V GS = 0, the channel between the gate junctions is fully open. On application of small voltage of V DS , the n-type bar simply acts as a semiconductor and the drain current I D increase linearly with V DS . As the voltage V DS is progressively increased a value of...