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…
Parameters of JFET: JFET has certain parameters which determine the performance. Such Parameters of JFET are (i) ac drain resistance, (ii) transconductance, (iii) amplification factor, and (iv) dc drain resistance, as explained below: 1. AC…
JFET as an Amplifier: One of the applications of JFET as an Amplifier of input signal. In FET the weak signal is applied between gate and source and an amplified output is taken across the…
JFET Temperature Effects: The JFET, like other solid state devices, is subject to the JFET Temperature Effects. However, it is possible to bias the JFET such that it will exhibit a zero temperature coefficient i.e.…
FET Configurations: FETs (JFETs and MOSFETs) have three configurations just as BJTs have. The three FET Configurations—the common gate, common source, and common drain configuration have been given in Fig. 13.11. Input and output terminals…
