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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
Open this folder and view contentsBipolar Transistor II
View the documentFirst Evaluation
close this folderLesson 4 - Transistor Fundamentals
close this folderLesson Plan
View the documentThe load line
View the documentThe operating point
View the documentRecognizing saturation
View the documentThe transistor switch
View the documentWorksheet No. 4
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
 

The load line

The load line contains every possible operating point for the circuit. A line is defined by two points. To draw the load line you have to get. the saturation point and the cutoff point:

Saturation point: Tells you the maximum possible collector current for the circuit.

Calculate: Visualize a short between the collector and emitter.

VCE --- > 0

Cutoff point : Tells you the maximum possible collector emitter voltage for the circuit. Calculate: Visualize the transistor internally open between collector and emitter.

VCE -- > VCC

VCE (cut) = VCC

Ex: Draw the load line for the given circuit.


Fig. 4-1: CE amplifier base biased


Fig. 4-2: Output curve

Saturation point:

Cutoff point:

 

VCE (cut) = VCC = 15V


Fig. 4-3: Output curve with loadline

HO: Suppose the collector resistance (in Fig. 4-1) is increased to 6KΩ. What happens to the dc load line?

Solution:

VCE (cut) = 15V

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