In this case, the two pn-junction across the bar sides generates a depletion region. In case 1, the voltage at the gate pin is zero, and voltage Vds is applied between drain and source terminal as shown in the figure below. The working of N-Channel JFET can be described as follows by taking two different cases: Case 1: The current-carrying path that exists between the source and drain terminals is known as “channel” which can be composed of either N-type or P-type semiconductor material. The conductivity process is controlled by applying the input voltage at the gate terminal. The FET is an electronic device that contains charge carriers, either electrons or holes that flow from source to drain terminals through the active channel. The following figure shows the symbol of MOSFET and JFET transistors that are the two main types of FET transistors. The low power consumption and low power dissipation make this device an ideal fit for integrated circuits. FET transistors usually come with high input impedance at low frequencies and display instant operation, high operation, are robust and cheap, and are used in many electrical circuits. But conduction process doesn’t involve both charge carriers at the same time. In FETs, either holes or electrons are used for the conduction process. Gate: This terminal controls the conductivity between source and drain terminals.įETs are also known as unipolar transistors as opposed to BJTs that are bipolar transistors.Drain: It is a terminal through which charge carriers leave the channel.Source: It is a terminal through which charge carriers enter the channel.The three terminals in this device are named drain, source, and gate. The FET(Field Effect Transistor) is a three-terminal electronic device used to control the flow of current by the voltage applied to its gate terminal. I’ll walk you through the FET (Field Effect Transistor) in detail and cover each and everything related to FET including FET definition, symbol, working, characteristics, types, and applications.
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