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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
 

Other configurations

Up to now we discussed only the common emitter configuration, which is widely used. But for some circuit conditions the common base or the common collector configuration may be a better choice.

As we had already seen, the input/output impedance of an amplifier is a very important characteristic, because the internal impedance of signal sources vary widely:

Ex:

Antenna --- > approx. 50 Ω
Microphone --- > approx. 100000 Ω

To choose the best configuration let's have a look at its characteristics.

See Handout No. 2 (let the students complete)

Common base CB

- High voltage gain
- No current gain
- Low input impedance
- High output impedance
- No phase inversion

Common collector CC

- No voltage gain
- High current gain
- High input impedance
- Low output impedance
- No phase inversion

Common emitter CE

- High voltage gain
- High current gain
- Medium input impedance
- Medium output impedance
- Phase inversion
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