西服review审查二极管半导体有ve还.pdf

The semiconductor has a –ve or +ve? Metal has + ve a Temp Semiconductor has -ve a Temp What is the depletion layer? If the diode is reverse biased, the depletion layer will be narrowed or widened? High -resistivity depletion layer P N + + + Diode conducts when forward/reversed biased. P N Forward biased e e + When the reverse breakdown occurs, what about the current flow in the diode? Reverse volts Junction Reverse breakdown current voltage(V ) Z Reverse current rease suddenly The forward voltage across a Si diode is 0.4v. Will it conducts? No, the forward voltage drop is 0.6 for Si. When temperature reases, reverse leakage current reased/decreased. reased What is the function of the zener diode? It is operated in ? Region. Voltage reference, Operate in the reverse breakdown region How to make a SCR to conduct? How to cutoff the SCR? t n e r r I anode u g1 c