Introduction to Transistors

What is a transistor? A modern transistor is an electronic device that uses a semiconductor to amplify or switch electronic signals. It is usually a three-terminal device, where the current through two terminals is controlled using the voltage at the third terminal. Modern transistors are used to create microprocessors, cellular

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MOSFET circuit model

Small signal model, high-frequency and low-frequency model, Common Drain, Common Gate, Common Source, Transconductance, thermal noise, flicker noise, capacitances,etc.

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PNP BJT Transistor

Simplified cross-section diagram of PNP BJT, Small signal model, Symbol of PNP BJT, Single stage amplifiers (CE, CC, CB), Biasing a PNP transistor in active mode.

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NPN BJT Transistor

Simplified cross-section diagram of NPN BJT, Small signal model, Symbol of NPN BJT, Single stage amplifiers (CE, CC, CB), Biasing a NPN transistor in active mode.

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Latchup

Parasitic BJT in CMOS, lateral n-p-n and vertical p-n-p, SCR, subtrate resistance, guard rings, Positive feedback, epitaxial process etc.

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Junction Field Effect Transistor (JFET)

Junction Field-Effect Transistors (JFETs) are three-terminal semiconductor devices used in electronics to provide a robust high impedance with lower noise. JFETs act as voltage-controlled current sources and voltage-controlled switches

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MOSFET

Energy band diagram, Drift current, Terminals in a MOSFET, Threshold voltage, Small signal model, Channel length modulation, Pinch-off region, Linear region, Capacitances, Noise.

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Power MOSFET

High power, fast switching, DC model, Switching Model, Specifications of power MOSFET, Channel resistance, Parasitic capacitance, Heat dissipation, Packages available

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