A bipolar junction transistor is a silicon-made electronic component where holes and electrons are used as charge carriers. This transistor allows a small current at one of its terminals to control a large amount of current supplying between the other terminals so that the device is capable of performing amplification or switching. BJT can be formed with three semiconductor material layers which are available in two types PNP and NPN. So the NPN transistor includes two N-type semiconductors and … [Read more...]