By Kishore, K. Lal
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Example text
Equation 10 ~ loss [1- ~s r This is a square law. This is another name for parabolic shape. So JFET is often called as a square law device. 6 What is the DC input resistance of a JFET which has (pA) at 20 V? 3 4 x 10 12 n Common Source (CS) Amplifier When a small AC signal is coupled into the gate, it produces variations in gate - source voltage. This produces a sinusoidal drain current. Since AC flows through the drain resistor, we get an amplified AC voltage at the output. IMn -VG Fig. 27 (b) Common Source Amplifier This is FET equivalent of common emitter transistor amplifier in BJT.
7 Swamping Resistor The resistor that is connected in series with the source resistance Rs is called Swamping resistor. The source resistance Rs is bypassed by Cs' the source bypass capacitor. (Similarly to RE in BJT circuit) 26 Electronic Circuit Analysis VI 0---11---1---+-+1 Fig. 29 Circuit with Swamping resistor VI Fig. 30 Equivalent circuit If rs is not there, source is at ground potential. But when rs is connected, AC current is passing, through this, because source is not at ground potential.
For Common Collector Configuration, hre :::: 1. The graphs (variation with Rc) are similar to Common Base Configuration. Characteristics 1. High Input Resistance:::: 3 Kfl (R,J 2. Low Output Resistance 30 n. (RoJ 3. Good Current Amplification Ai » 1 4. Av:S 1 5. Lowest Power Gain of all the configurations. Since, Ay is < 1, the output voltage (Emitter Voltage) follows the input signal variation. Hence it is also known as Emitter Follower. The graphs of variation with RL and Its are similar to Common Base amplifier.