The diagram of a p-n-p transistor is shown belowįor p-n-p transistors, current enters into the transistor through the emitter terminal. Similarly for p-n-p bipolar junction transistor (or pnp transistor), an n-type semiconductor is sandwiched between two p-type semiconductors. Transistor type I E I B I C V EB V CB V CE n-p-n – + + – + + PNP Bipolar Junction Transistor ![]() We can tabulate the different currents and voltages inside the n-p-n transistor. According to the convention if for the emitter, base and collector current I E, I B and I C current goes into the transistor the sign of the current is taken as positive and if current goes out from the transistor then the sign is taken as negative. Now I E, I C is emitter current and collect current respectively and V EB and V CB are emitter-base voltage and collector-base voltage respectively. In an n-p-n bipolar transistor (or npn transistor) one p-type semiconductor resides between two n-type semiconductors the diagram below an n-p-n transistor is shown The next topic will describe the two types of these transistors. Now initially it is sufficient for us to know that emitter based junction is forward biased and collector-base junctions are reverse biased. J E and J C represent the junction of emitter and junction of collector respectively. A diagram of these two types of bipolar junction transistors is given below.įrom the above figure, we can see that every BJT has three parts named emitter, base and collector. There are two types of bipolar junction transistors – NPN transistors and PNP transistors. Note that it does require an external source of DC power supply to carry out the amplification process. ![]() This is the amplification provided by the BJT. A BJT is a type of transistor that uses both electrons and holes as charge carriers.Ī signal of small amplitude if applied to the base is available in the amplified form at the collector of the transistor. ![]() The three terminals of the BJT are the base, the collector and the emitter. Bipolar Junction Transistors CharacteristicsĪ Bipolar Junction Transistor (also known as a BJT or BJT Transistor) is a three-terminal semiconductor device consisting of two p-n junctions which are able to amplify or magnify a signal.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |