6 - Diodes

6 Diodes - ELEC300V ELEC300V Fundamental of of Electro-Robotics Fall 2008 Lecture 6 More on diodes Diode Diode Semiconductor device PN-junction ID

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LEC300V undamental of ELEC300V – Fundamental of Electro-Robotics Fall 2008 ecture 6 Lecture 6 More on diodes
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iode Diode • Semiconductor device I D • PN-junction + + + + +- - - - - + - V D • Current flows more easily in one direction – Forward biased =>current flow is large – Backward biased =>current flow is practically zero • Diode is a non-linear device, i.e. I-V curve is not linear D V qV ) 1 ( ) 1 ( E V s kT s e I e I i I s : Saturation current ( in the range of nA to pA) q: electric charge = 1.6X10 -19 C k: Boltzmann constant:1.38X10 -23 T: temperature in Kelvin (K)
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Approximate I-V curve • Real I-V curve • Ideal I-V curve region On Off region V on ) 1 ( E D V V e I I Piecewise linear model S D 1K V I S =1pA Break the I-V characteristic Into two linear parts + - 1V V E =50mV Part 1 (off mode): when V D V on , I D = 0, open circuit Part 2 (on mode): when V () D V on , voltage source of V on .
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Piecewise Linear Model (PLM) • The I-V curve of the device is broken down into several different linear models. • To analyze the circuit, determine which linear model you should use based on an guess of the parameters
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This note was uploaded on 01/28/2011 for the course ELEC 300V taught by Professor C.ytsuiandmansunchan during the Fall '08 term at HKUST.

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6 Diodes - ELEC300V ELEC300V Fundamental of of Electro-Robotics Fall 2008 Lecture 6 More on diodes Diode Diode Semiconductor device PN-junction ID

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