FET as a Voltage Variable Resistor (VVR): FET is a device that is usually operated in the constant-current portion of its output characteristics. But if it is operated in the region prior to pinch-off (i.e.,…

Applications of FETs (Field Effect Transistors): Applications of FETs - FET has a very high input impedance (100 MΩ in case of JFETs and 104 to 109 MΩ in case of MOSFETs), the major shortcomings of…

Generalized FET Amplifier Circuit: The analysis of a common source amplifier with a source resistance RS, a common gate amplifier and a common drain amplifier at low frequencies may be made by considering the Generalized…

Common Gate JFET Amplifier and its AC Equivalent Circuit: The circuit of a simple Common Gate JFET Amplifier is shown in Fig. 13.53 and its ac equivalent circuit is shown in Fig. 13.54. In this…

Common Drain JFET Amplifier or Source Follower: In the Common Drain JFET Amplifier circuit (also called the source follower), the output voltage is developed across source resistor RS. External load resistor RL is connected to…

Common Source JFET Amplifier with AC Equivalent Circuit: The Common Source JFET Amplifier Circuit configuration is the most widely employed configuration. It is because this configuration provides high input impedance, good voltage gain and moderate…

Small Signal Model of FET: The Small Signal Model of FET which consists of Low Frequency Small Signal Model for FET and High Frequency Model for FET. Low Frequency Model: In a FET, instantaneous drain…

FET Biasing Methods - Fixed Bias, Self Bias, Potential Divider Bias and Current Source Bias: Unlike BJTs, thermal runaway does not occur with FETs. However, the wide differences in maximum and minimum transfer characteristics make…

DC Load Line and Bias Point of FET Circuit: The DC Load Line and Bias Point for a FET circuit is drawn upon the output characteristics of the device in exactly the same way as…