EE 332 Lecture 3 2019.pdf - EE 332 Devices and Circuits II Lecture#3 ©UWECE TC Chen BIPOLAR JUNCTION TRANSISTOR VS MOSFET • The transistors BJT and

EE 332 Lecture 3 2019.pdf - EE 332 Devices and Circuits II...

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4/3/2019 1 ©UWECE TC Chen EE 332: Devices and Circuits II Lecture #3 ©UWECE TC Chen BIPOLAR JUNCTION TRANSISTOR VS. MOSFET The transistors BJT and MOSFET are both useful for amplification and switching applications. BJT is a semiconductor device that replaced the vacuum tubes of the old days. BJTs are preferred for low current applications, while MOSFETs are for high power functions. In digital and analog circuits, MOSFETs are considered to be more commonly used than BJTs these days. The operation of MOSFET depends on the voltage at the oxide-insulated gate electrode, while the operation of BJT is dependent on the current at the base.
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4/3/2019 2 ©UWECE TC Chen BIPOLAR TRANSISTOR: PHYSICAL STRUCTURE Consists of 3 alternating layers of n - and p -type semiconductor called emitter ( E ), base ( B ) and collector ( C ). Majority of current enters collector, crosses base region and exits through emitter. A small current also enters base terminal, crosses base-emitter junction and exits through emitter.
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