Since it is designed to turn on and off rapidly, the IGBT can synthesize complex waveforms with pulse-width modulation and low-pass filters, thus it is also used in switching amplifiers in sound systems and industrial control systems.OverviewAn insulated-gate bipolar transistor (IGBT) is a three-terminal primarily forming an electronic switch. It was developed to combine high efficiency with fast switching. It consists of four alterna. An IGBT cell is constructed similarly to an n-channel vertical-construction, except the n+ drain is replaced with a p+ collector layer, thus forming a vertical PNP. This additional p.