01 - Semiconductor Devices

# 01 - Semiconductor Devices - EECS 320 Semiconductor Devices...

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EECS 320 Semiconductor Devices Linear Circuits In EECS 215 you learned about linear devices and circuits R 2 i C R 1 v in (t) L 2i L v C + - i L C v L +- J. Phillips EECS 320 In EECS 320, you will learn of important nonlinear devices: Diodes and transistors

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Diode A one way valve for current flow I Ideal I Actual V V ( ) 1 / 0 = kT qV e I I Anode J. Phillips EECS 320 Cathode +- V I Diode Applications Rectifier Power conversion Over-voltage protection Light emitter (light emitting diode LED) Light detector (photodiode, solar cell) J. Phillips EECS 320
Diode Rectifiers Half-wave rectifier Full-wave rectifier J. Phillips EECS 320 Light Sensitive Diodes Light-emitting Diode Semiconductor Laser J. Phillips EECS 320 Visible Light Sensor

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Constant Voltage Drop Model For Diodes Simple circuit analysis using constant voltage drop model You will learn why V D ~0.7V in 320! J. Phillips EECS 320 V DD = 5 V mA R V I DD D 3 . 4 000 , 1 7 . 0 5 7 . 0 = = = R=1k Ω Solution for Exponential Diode Model; Load Line By superimposing Diode I-V and Linear circuit I-V, you can find graphical solution for circuit Linear circuit I D V D V DD /R L V DD (I D , V D ) solution V DD I D R L V D + - J. Phillips EECS 320 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
Transistor tran•sis•tor (trán-zìs’ter) A solid-state electronic device that is used to control the flow 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 Input put ce J. Phillips EECS 320 Idea: control large output with small input This device should exhibit gain T Outp Sour Transistor Types Bipolar (BJT) Field-effect (FET) In general, there are two types of transistors A three terminal device in which emitter to A transistor in which the output current is 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 Collector Base Gate Drain J. Phillips EECS 320 E Emitter Source Single device Integrated circuit

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01 - Semiconductor Devices - EECS 320 Semiconductor Devices...

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