13- Diodes and Transistors 1

13- Diodes and Transistors 1 - Nonlinear Devices...

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Nonlinear Devices Introduction: Diodes and Transistors © Fred Terry and Jamie Phillips all Semester, 2008 Fall Semester, 2008 1
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troduction Introduction • Some Very Useful Applications Require Linear yp p q Circuits – Amplification, Filtering, Additive/Subtractive Mixing • Some Very Useful Applications Require Nonlinear Circuits C/DC Conversion Multiplication of Signals – AC/DC Conversion, Multiplication of Signals • Some Useful Active Devices Are Inherently Nonlinear – How Can We Use Them? – In Particular, How Can We Obtain ~ Linear Circuits If ome Elements Are Nonlinear? 2 Some Elements Are Nonlinear?
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iode A one way valve for current flow Ideal Actual Diode I I ( ) 1 / 0 = kT qV e I I V V Anode Cathode +- I 3 V
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iode Applications Diode Applications • Rectifier ower conversion Power conversion • Over-voltage protection • Light emitter (light emitting diode LED) • Light detector (photodiode, solar cell) 4
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iode Rectifiers Diode Rectifiers Half-wave rectifier Full-wave rectifier 5
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ight Sensitive Diodes Light Sensitive Diodes Light-emitting Diode Semiconductor Laser 6 Visible Light Sensor
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Constant Voltage Drop Model For Diodes You will learn why V D ~0.7V in 320! Simple circuit analysis using constant voltage drop model mA R V I DD D 3 . 4 000 , 1 7 . 0 5 7 . 0 = = = 7 V DD = 5 V R=1k Ω
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ransistor Transistor an•sis•tor (trán ìs’ter) 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 lock of a semiconductor with at least three electrodes block of a semiconductor with at least three electrodes rans(fer) + (res)istor Input Trans(fer) + (res)istor Idea: control large output T utput ource with small input O So 8 This device should exhibit gain
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ransistor Types Transistor Types ipolar (BJT) ield ffect (FET) In general, there are two types of transistors Bipolar (BJT) Field-effect (FET) A three terminal device in which emitter to collector current is controlled by base current
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13- Diodes and Transistors 1 - Nonlinear Devices...

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