It is the right hand section/region of the transistor or in simple words the region located opposite to the emitter is called collector the function of a collector is to collect majority charge carries through base. The collector base junction is reversed based (having high resistance). The emitter base junction is forward biased. The basic function of base is to control the flow of charges. It is the middle section/region of a transistor it is very thin (10m -16) as compared to emitter and collector. For PNP type transistor emitter supplies holes charges to base while for NPN type transistor emitter supplies electrons to base. The function of emitter is to supply majority charge carries to base. This is the left hand section/region of a transistor. Hence every transistor consists of three regions or electrodes (emitter, base and collector), let’s discuss each one of it. The Arrow head is always at emitter and shows the direction of conventional current.įor PNP-type transistor the arrow head points from emitter to base hence we can say that emitter is +ive with respect to base.įor NPN type transistor the arrow head points form base to the emitter hence we can say that base is base is +ive with respect to emitter. The structure and Symbol of both PNP and NPN transistors are given below. Now, each transistor whether if it is a PNP type or NPN type Semi conductor has three regions namely Emitter, Base, and Collector. Similarly, for NPN-type transistor a thin layer of P-type Semi conductor is sandwiched between two N-type Semi conductors. This arrangement gives us two types of Transistorsįor PNP type Transistor a thin layer of N-type Semi conductor is sandwiched between two P-type Semi conductors. This is the second condition carrying the transistor as a Bipolar junction transistor. When two PN-junction diodes are placed back to back or opposite to each other, we get a transistor with two junctions. It is the first condition carrying the transistor as Bipolar junction transistor BJT. Transistor is called a Bipolar junction transistor BJT because the function of a transistor is based on both majority charge carriers (F.b) and minority charge carriers (R.b). Transistor / Bipolar Junction Transistor BJT: Biasing and working of PNP Transistor t/r:.Transistor / Bipolar Junction Transistor BJT:.
0 Comments
Leave a Reply. |