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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
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
close this folderLesson 9 - Small Signal Amplifier III
close this folderLesson Plan
View the documentOther configurations
View the documentFrequency response of an amplifier
View the documentThe AC load line
View the documentHandout No. 2
View the documentWorksheet No. 9
Open this folder and view contentsLesson 10 - Large Signal Amplifier
View the documentThird Evaluation
 

The AC load line

In previous lessons we used the dc load line to analyze biasing circuits. But an amplifier sees two loads, a dc load and a ac load. Now we will use the ac load line to understand the large signal operations.


Fig. 9-2: CE amplifier

DC values: VB = 1.8V, VE = 1.1V, IE = 1.1 mA, VC = 6.04V VCC = 10V, VCE = 4.94V

Without load: DC an ac load line are the same.

With load: rc = RC//RL

AC Load Line Construction

The following process shows you an easy method to get the ac load line:

1. Draw the dc load line

VCE (cut) = VCC - VE = 8.9V

2. Calculate and draw the Q point

IC = 1.1 mA

VCE = 6.04V

3. Draw a -temporary ac load line

VCE (cut) = VCC

4. Construct the ac load line

- parallel to the temporary ac load line
- passing the Q point


Fig. 9-3: Construction of an ac load line

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