Ch18 - andDevices Topic18: Fall2007 Learning Objectives transistors

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    Topic 18 : Junction Field Effect Transistors                       Fall 2007 ECE 3500 - Semiconductor Materials  and Devices
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    Learning Objectives In this topic you will learn: How BJT’s differ from FET’s The different modes of operation of  transistors The physical operation of the JFET. How to calculate the current-voltage  characteristics of a JFET.  What the transconductance of a JFET is and  how to calculate its value. The physical structure of a GaAs MESFET
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    Introduction to Field Effect Transistors   The devices studied so far have been  two- terminal  devices. Although these devices  allow for regulation of current and voltage,  their output cannot be  independently  controlled . For that we need to use  three- terminal  devices. The simplest three-terminal  devices are  transistors .
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    Introduction to Field Effect Transistors (cont’d)     There are two main types of transistor: Field Effect Transistors (FETs) Bipolar Junction Transistors (BJTs)        FETs have source, drain and gate contacts and  the drain- to-source current is controlled by the gate-to-source  voltage =>  Voltage-controlled current source.      BJTs have collector, base and emitter currents     and the collector current is controlled by the base current  =>  Current-controlled current source
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    Introduction to Field Effect Transistors (cont’d)   Transistors may be used as  amplifiers  or as  switches        As  amplifiers  a small signal is used to control  a large signal. 
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This note was uploaded on 03/11/2010 for the course ECE 4350 taught by Professor Singh during the Spring '07 term at Villanova.

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Ch18 - andDevices Topic18: Fall2007 Learning Objectives transistors

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