Lecture22

Forward active minority carrier distribution two main

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Unformatted text preview: d Active Minority Carrier Distribution Two main pictures for P+NP bipolar transistors: EE 332 Spring 2013 PNP Physical Currents EE 332 Spring 2013 Reality check. This is what a more realistic BJT looks like: Realistic BJT §༊  §༊  §༊  What kind of bipolar transistor is this? What kind of bipolar transistor isand p+ regions? What’s with all the extra n+ this? What about the SiO2? What is the cross-sectional area? What’s with all the extra n+ and p+ regions? EE 332 Spring 2013 Circuit Configuration Circuit Configuration EE 332 Spring 2013 Common Base DC Current Gain IC = αDCIE + ICB0 ICp = αTIEp = αTγIE αDC = αTγ IC = αTγIE + ICn EE 332 Spring 2013 Common Emitter DC Current Gain IE = βDCIB + ICE0 βDC = αDC /(1-αDC) IC = αDCIE + ICB0 = αDC(IC + IB) + ICB0 IC = αDCIB + ICB0 1-αDC GAIN !! IC IB IE EE 332 Spring 2013 IV Characteristics VEB >-VBC > 0 à༎ VEC > 0 but small IE > -IC > 0 à༎ IB > 0 VEB, VBC > 0 à༎ VEC >> 0 IE, IC > 0 à༎ IB > 0 VEB < 0, VBC > 0 à༎ VEC > 0 IE < 0, IC > 0 à༎ IB > 0 but small EE 332 Spring 2013 Modes of Operation Modes of Operation Bias Mode E-B Junction C-B Junction Saturation Forward Forward Active Forward Reverse Inverted Reverse Forward Cutoff Reverse Reverse EE 332 Spring 2013 BJT Fabrication EE 332 Spring 2013...
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This document was uploaded on 02/18/2014.

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