6 - Diodes

# Voltage or current that define the piecewise linear

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(voltage or current) that define the piecewise linear model Based on the selected model, solve your circuit and then check whether the parameters meet with your check whether the parameters meet with your assumption or guess. If yes, you are done If t h t l t th li d l ith th If not, you have to select another linear model with another guess of the parameters Linearized OFF model of a diode Linearized ON model of a diode + - V D I D + - V D =V on I D Parameter Test: V D V on Parameter Test: I D 0

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Other Diodes Light-emitting diodes Create light energy in proportion to the current flow through the diode – V on is higher, e.g. 1.2V Photodetector diode – Current flow through the diode depends on the light intensity Current flow through the diode depends on the light intensity Zener Diodes Similar to normal diode when operating in forward bias mode. However they are designed to use in reverse bias mode However, they are designed to use in reverse bias mode When reverse biased, the diode will breakdown at a selected reverse bias voltage intentionally Use for protection Linearized OFF mode I Linearized ON model V V ON I D + - V D + - V D D V D V on + - D =V on I D I D 0 OFF REVERSE V on = 0.7V V BD = -5.7V 3 i i li V on =0.7V V BD =5.7V Linearized reverse ON model + V D
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