전기전자기초실험 Chapter 4 Various Diodes and Its Properties Pre-report
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2011년 2학기 전기전자기초실험 보고서입니다. 전부 다 영어로 작성되어 있으며, 예비보고서의 경우 주석 충분히 달려 있습니다. 베끼지 않고 작성하여, 이 자료를 쓰셔도 Cheating의 염려가 없습니다.
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① What is bias?
fig 4-1.
Bias is current or voltage that is operated on desirable condition. That means, bias can determine the point of act components. In fig. 4-1, represents the relation of voltage and current on diode, conductance(reciprocal of resistance that is represent as an incline in figure) is differ from each values of voltage and current. That is, bias determines the point of acting components.∙Reference
Behzad Razavi, Fundamentals of Microelectronics, 2008, page 42-48
② Why do we use bias when it comes to circuit.
From in this part, diode, one of semiconductor, is used on circuit and it is nonlinear element. Circuit that contains nonlinear element is difficult to analyze and bias makes that easier to understand circuit. Adopt the biasing in circuit, the nonlinear element approximates to linear element, so it can make easy to analyze. Of course it is an approximation, there maybe some errors in real circuit, but we can know ‘how it works roughly’. That’s the reason we use bias. Biasing [Online]. Available: http://en.wikipedia.org/wiki/Biasing
③ Explain why junction diode allows current when forward bias, and does not when reverse bias.
When forward bias, external voltage tends to create an electric field, p side to n side. It weakens the internal depletion region and allows current. In opposite, when reverse bias on circuit, external voltage tends to create an electric field, n side to p side. It strengthens the internal depletion region and blocks current. Behzad Razavi, Fundamentals of Microelectronics, 2008, page 42-48
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