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close this bookAmplifier Teaching Aid (GTZ, DED; 86 pages)
View the documentPreface
View the documentIntroduction
Open this folder and view contentsLesson 1 - Semiconductor Review
Open this folder and view contentsLesson 2 - Bipolar Transistor
close this folderBipolar Transistor II
close this folderLesson Plan
View the documentIntroduction
View the documentCollector curves (output)
View the documentTransistor power dissipation
View the documentTransistor test
View the documentWorksheet No. 3
View the documentExperiment No. 3
View the documentFirst Evaluation
Open this folder and view contentsLesson 4 - Transistor Fundamentals
Open this folder and view contentsLesson 5 - Transistor Biasing
Open this folder and view contentsLesson 6 - Transistor Biasing II
View the documentSecond Evaluation
Open this folder and view contentsLesson 7 - Small Signal Amplifier
Open this folder and view contentsLesson 8 - Small Signal Amplifier II
Open this folder and view contentsLesson 9 - Small Signal Amplifier III
Open this folder and view contentsLesson 10 - Large Signal Amplifier
View the documentThird Evaluation
 

Collector curves (output)


Fig. 3-3: NPN transistor collector curve (2N3904)


Fig. 3-4: PNP transistor collector curve (2N3905)

Recall Kirchhoffs voltage law: (see Fig. 2-7)

VCE = VCC - IC * RC

Ex: Analyse the following circuit


Fig. 3-5: Base biased CE connection, β=100

IC = βdc * IB = 6.2 mA

VCE = VCC - IC * RC = 15V - (6.2 mA * 1 KΩ) = 8.8V

Regions of Operation


Fig. 3-5: Regions of operation

Active region :

Normal operation
Emitter diode forward biased
Collector diode reverse biased
===> horizontal part of the curve

Breakdown region:

Transistor should never operate in this region

Saturation region:

VCE between 0V ----> 1V
===> rising part of the curve

Cutoff region:

IC approximately zero

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