ElectronicsI_L21 - Lecture 21 CE Resistance in Saturation...

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Unformatted text preview: Lecture 21 CE Resistance in Saturation The BJT operated in common emitter mode in saturation acts like a small valued resistor The value tends to be from a few ohms to a few tens of ohms. There is also a voltage offset present This can be developed into a model of the BJT in saturation The collector terminal is a resistor and battery BJT in Saturation Because there is an offset voltage in the saturated BJT model, they are less attractive as a switch. The MOSFET in comparison cross the origin, meaning that the off state will result in zero volts out. We can use the Ebers-Moll model to describe the current through the BJT with a constant current applied to the base for saturation operation. ( ) + = R F V v R V v B F C T CE T CE e e I i 1 Breakdown Because the BJT consists of p-n junctions, there is the possibility to have breakdown occur. Needless to say this leads to non-ideal behavior In a common base configuration, the collector- base junction breaks down at a voltage BV CBO with no emitter current (>50V).with no emitter current (>50V)....
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This note was uploaded on 02/13/2012 for the course PHYSICS 16.365 taught by Professor Staff during the Summer '10 term at UMass Lowell.

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ElectronicsI_L21 - Lecture 21 CE Resistance in Saturation...

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