Chapter 3 Diodes1 - /2/12 . Chapter 3 Diodes Physical...

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S J T U J. C h e n 1 3/2/12 Physical Operation of Diodes Chapter 3 Diodes
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3/2/12 SJTU J. Chen 2 Part 1. Physical operation of diodes Part 2. Analysis of diode circuits and applicat ions of diodes Content
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S J T U J. C h e n 3/2/12 Part 1. Physical operation of diode s
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3/2/12 SJTU J. Chen 4 Linear and Nonlinear Devices So far, almost all the devices we have learnt ar e linear Many signal-processing functions, however, are implemented by nonlinear devices Linear amplifier Nonlinear amplifier
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3/2/12 SJTU J. Chen 5 Diode and its physical structure The diode is the simplest and most fundamental nonlinear circuit element The most important region is the boundary betw een n -type and p -type semiconductor, which is c alled pn junction pn junction
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3/2/12 SJTU J. Chen 6 Symbol and characteristic for the ideal diode (a) diode circuit symbol + v - i Anode Cathode (b) i–v characteristic ---Reverse bias--- ---Forward bias--- i 0 v (c) equivalent circuit in the reverse direction v < 0  i =0 i + v - i (d) equivalent circuit in the forward direction i > 0  v =0 + v -
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3/2/12 SJTU J. Chen 7 How does it happen? To answer the question, we need to know: Material, structure and the related features (cr ystal and semiconductor in particular) New particles to carry charge in addition to ele ctrons New mechanism(s) of conduction in addition t o what we have known Techniques to manufacture the devices (not in cluded in this course)
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3/2/12 SJTU J. Chen 8 Basic semiconductor concepts Intrinsic Semiconductor ( ? ? ? ? ? ) Doped Semiconductor ( ? ? ? ? ? ) Carriers ( ? ? ? ) Diffusion ( ? ? ? ? ), Drift ( ? ? ? ? )
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3/2/12 SJTU J. Chen 9 Elements and material Periodic table
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3/2/12 SJTU J. Chen 10 Elements and material (in Chine se)
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Chapter 3 Diodes1 - /2/12 . Chapter 3 Diodes Physical...

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