06 - Transistors

# 06 - Transistors - EECS 215 Nonlinear Circuit Elements...

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EECS 215 Nonlinear Circuit Elements: Diodes and Transistors J. Phillips EECS 215 A one way valve for current flow I V Ideal I V Actual ( ) 1 / 0 = kT qV e I I Anode Cathode + - V I Diode

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J. Phillips EECS 215 Diode Applications Rectifier Power conversion Over-voltage protection Light emitter (light emitting diode LED) Light detector (photodiode, solar cell) J. Phillips EECS 215 Diode Rectifiers Half-wave rectifier Full-wave rectifier
J. Phillips EECS 215 Light Sensitive Diodes Light-emitting Diode Semiconductor Laser Visible Light Sensor J. Phillips EECS 215 Constant Voltage Drop Model For Diodes Simple circuit analysis using constant voltage drop model V DD = 5 V mA R V I DD D 3 . 4 000 , 1 7 . 0 5 7 . 0 = = = You will learn why V D ~0.7V in 320! R=1k

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J. Phillips EECS 215 Solution for Exponential Diode Model; Load Line By superimposing Diode I-V and Linear circuit I-V, you can find graphical solution for circuit I D V D V DD /R L V DD (I D , V D ) solution V DD I D R L Linear circuit V D + - Direct calculation results in transcendental equation, requiring non-linear solver, numerical techniques, etc L D DD D R V V I = = kT qV I I D D exp 0 J. Phillips EECS 215 Transistor tran•sis•tor (trán-zìs’ter) A solid-state electronic device that is used to control the flow of electricity in electronic equipment and consists of a small block of a semiconductor with at least three electrodes Trans(fer) + (res)istor Idea: control large output with small input This device should exhibit gain T Input Output Source
J. Phillips EECS 215 Transistor Types Bipolar (BJT) Field-effect (FET) In general, there are two types of transistors A three terminal device in which emitter to collector current is controlled by base current A transistor in which the output current is controlled by a variable electric field (gate voltage) I B I E I C B C E Collector Base Emitter Gate Drain Source Single device Integrated circuit J. Phillips EECS 215 Objectives Related to Transistors in 215 Basic use of transistors in amplifier circuits and digital circuits Examine a few common/useful circuits How do we account for nonlinear I-V? Can we use the techniques we have learned for linear circuits?

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