![]() Base: The size of the base region is extremely small, it is less than emitter as well as the collector.The size of the emitter is more than base but less than the collector. This is because the work of the emitter is to supply charge carrier to the collector via the base. Emitter: Emitter terminal is the heavily doped region as compared two base and collector.I intend to explain the working of the transistor with the help of these paramount parameters.īefore I delve into the working details of the transistor, let’s understand these three significant terminals of the transistor and their characteristics. One is the Emitter-base junction, and the other is Collector- base junction. Thus, there are two junctions of the transistors. Thus, as there are three terminals of the transistor, i.e. The transistor as its names suggests transfer resistance from one channel to other channels. We will discuss functions of these three terminals in the working of the transistor.Ī transistor is a semiconductor device, so the semiconductor material used in its construction can be either germanium or silicon, but silicon is preferred over germanium because it possesses smaller cutoff current. ![]() The three terminals have specific names that are as follows:. The transistor formed in the former case will be NPN transistor and that formed in the latter case is PNP transistor. We can use either sandwiched P-type layer of the semiconductor between two N-type semiconductors or by sandwiching N-type layer between two P-type semiconductor specimen. A diode is two terminal device, thus, if we merge the two diodes provided that one terminal is common, the resulting device will comprise of three terminals. Let’s discuss constructional features of the transistor, how this 3 terminal device is formed. Now, all the computing devices are available in small size which we can easily carry with us anywhere. In the year 1947, John Bardeen along with William Shockley & Brattain invented the transistor. But this all has become possible with the invention of the transistor. Obviously, to work with it is a cumbersome process.įortunately, we have compact size processing system in the contemporary world. Now you can imagine what will happen if the entire room consists of a single processing system. ![]() This is because devices such as computers were entirely based on them.īut the problem started with their size which can capture the entire room. In the beginning of 20 th century when the vacuum triode was invented, it was considered as the significant development in the field of electronics. It is customary to forward bias the emitter-base junction of a bipolar junction transistor as this increases the width of the depletion region whereas the base-collector junction is reverse biased.Let me explain this with the subvention of history.The key to the fabrication of a transistor is to make the middle layer, the base, as thin as possible without shorting the outside layers.The base of a transistor is lightly doped and very thin due to which it offers the majority charge carrier to the base. The collector section of the transistor is moderately doped, but larger in size so that it can collect most of the charge carrier supplied by the emitter. The emitter of a transistor is heavily doped and moderate in size. The emitter-base is forward-biased and offers low resistance to the circuit. The base forms two circuits, the input circuit with the emitter, and the output circuit with the collector. The collector-base junction is always reverse biased. The emitter is always forward biased with respect to the base so that it supplies the majority charge carrier to the base. The collector-base junction is in reverse bias and offers higher resistance to the circuit. The middle section of the transistor is known as the base. In a transistor, the section that collects the majority of the charge carrier supplied by the emitter is called a collector. In a transistor, emitter supplies a large section of majority charge carriers. Transistors have three terminals namely Emitter, Collector, and Base.There are two types of standard (bipolar junction) transistors, NPN and PNP. ![]() Transistors are commonly used in amplification, switching, and buffering signals or applied.The word transistor is a contraction of the current-transferring resistor.The transistor is essentially a resistor that allows current to flow.Transistor: It is a semiconductor device that transfers a weak signal from a low resistance circuit to a high resistance circuit. ![]()
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