ElectronicsI_L26 - Lecture 26 Distortion in a BJT Amplifier...

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Lecture 26
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Distortion in a BJT Amplifier • The exponential nature of the BJT collector current leads to several forms of distortion: • There are two extremes: – Cutoff: If the input voltage swing goes too low, the emitter base junction goes out of forward bias and the BJT shuts off. The output is fixed at V CC . This would be known as hard limiting. – Saturation: When the collector base junction goes into forward bias, the beta of the BJT starts dropping. The current through the BJT becomes nearly constant and the collector emitter voltage becomes nearly constant too. • here the voltage output of the amplifier will no longer have a large gain, but it is not hard limiting like the cutoff effect.
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Mroe Dstirooitn • Even before we reach these hard limits there are other distortions that will occur. • Why were they called hard limits? They are fundamentally limited by the supply voltage range. • If our input exceeds the linearity limit, then we will see a variable gain depending on the input amplitude.
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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_L26 - Lecture 26 Distortion in a BJT Amplifier...

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