![]() ![]() In BJT, the current flow is due to both majority and minority charge carriers. electrons and holes for conduction is known as bipolar junction transistor (BJT).Ī type of transistor in which electric field is used to control the flow of current in a semiconductor is known as field effect transistor (FET). ParameterīJT stands for Bipolar Junction Transistor.Ī type of transistor which uses two types of charge carries viz. The following table shows the major differences between bipolar junction transistor and field effect transistor. The gate region of FET is made from alternate semiconductor material as compared to the channel between the source and drain terminals. In case of FET, there is no PN junction between the source and drain. Th Gatee circuit symbol of FET is shown in Figure-2.īased on the channel between the source and drain provided for current to flow, the FET is of two types viz. The FET is also a three terminal device, where the names of the terminals are Source, Drain and. For this reason, they are known as unipolar transistors. The flow of current in the field effect transistors is due to only one type of charge carrier (either hole or electron). What is FET?įET stands for Field Effect Transistor. The middle layer is the base of BJT that is most lightly doped. Here, the emitter and collector layers are heavily doped, the collector layer is doped lightly than the emitter. Each of these terminals is connected to each layer of BJT. The circuit symbols of NPN and PNP type bipolar junction transistors are shown in Figure-1. When N-type layer is sandwiched between two P-type layers, the resulting BJT is known as PNP transistor. When P-type semiconductor material is sandwiched between two N-type layers, the bipolar junction transistor is known as NPN transistor. A BJT consists of three alternating layers of P-type and N-type semiconductor materials and two P-N junctions. The BJT is the type of transistor in which the current flow is due to two types of charge carriers viz. What is BJT?īJT stands for Bipolar Junction Transistor. Go through this article to find out the important features of BJTs and FETs and how they differ from each other in the way they function. Engineering does not preclude common sense.Both BJTs and FETs are transistors widely used in different types of electronic applications. Common sense does not depend on language. It is advantageous to use 'English' sometimes when you want to describe the physical picture, but there are no cmos language, triode language etc. NOT to mention, who said triodes don't have cutoff and saturation? The only time these devices are used in the active region, or linier region, is in amplifiers (not even all).īringing "triode mode" in to this is meaningless. Go by the datasheets and don't overdo it. To ensure saturation, you may have to overdrive, within limits, and similar under-drive, or even negatively drive the devices to ensure full cutoff. In this switching mode, in both the above cases, the dissipation in the device is minimum, and Max power is controlled. ![]() In cut off or open state, all the voltage across the device, but negligible current. Saturation is min voltage across device, and Max current. Be it mosfet, fet or bipolar, for switching purpose, it is only in one definition: it is in saturation or cut off. ![]()
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