ece340Spring04HW14sol - ECE 340 1. Homework XII Due:...

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ECE 340 Homework XII Spring 2004 Due: Monday, April 19, 2004 1. A bipolar junction transistor uses a current variation in the base region to modulate the emitter-base voltage and hence a modulation on the injected current leading to a variation in the collector output current. So it is a current control mechanism. Field-effect transistors employ a different mechanism to control the output current by changing the charge density in the active region. The following problem is designed to illustrate the effect of changing charge density on the output current. Assume that a rectangular bar of silicon shown below consists of two layers, each of thickness t 1 and t 2 , respectively. The dimensions are D=100μm, W=5μm, t 2 = 1μm and t 1 =200Å. The t 1 layer is uniformly doped with N d1 /cm 3 donors and N d2 =10 11 /cm 3 donors are also uniformly doped in the t 2 layer. A bias of 1 V is applied between x=0 and x=W. Determine and plot the output current for different carrier densities in the t 1 layer. Specify the current for N
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This note was uploaded on 01/28/2010 for the course ECE 440 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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ece340Spring04HW14sol - ECE 340 1. Homework XII Due:...

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