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Back to the basics of power MOSFETs

Posted: 21 Feb 2007     Print Version  Bookmark and Share

Keywords:power MOSFETs  field effect transistor  bipolar transistor 

The Field Effect Transistor (FET), though structurally different from the bipolar transistor, provides the same "faucet" function. The difference: the FET is voltage controlled; one doesn't need base current but voltage to exercise flow control. The terminals are called DRAIN instead of COLLECTOR, GATE instead of BASE and SOURCE instead of EMITTER to differentiate it from its bipolar "cousin". The FET comes in two major variants, optimized for different types of applications: the JFET (junction FET) used in small-signal processing and the MOSFET (metal-oxide semiconductor FET) mainly used in linear or switching power applications.

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