Change to Ukrainian interface versionChange to English interface versionChange to Russian interface versionHome pageClear last query resultsHelp page
Search for specific termsBrowse by subject categoryBrowse alphabetical list of titlesBrowse by organizationBrowse special topic issues

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
Open this folder and view contentsLesson 9 - Small Signal Amplifier III
close this folderLesson 10 - Large Signal Amplifier
close this folderLesson Plan
View the documentLarge signal amplifier
View the documentClasses
View the documentClass A power amplifier
View the documentClass B power amplifier
View the documentClass AB power amplifier
View the documentWorksheet No. 10
View the documentThird Evaluation
 

Class B power amplifier

The class B amplifier is biased at cutoff. No current will flow until an input signal provides the bias to turn on the amplifier.


Fig. 10-2: Q point of a class B amplifier

Only one half of the input signal is amplified. Two transistors can be operate in class B together in one circuit, one transistor for the positive portion of the signal and one transistor for the negative portion of the signal (Push Pull):


Fig. 10-3: Push Pull amplifier


Fig. 10-4: Signal swing of a. push pull amplifier, Class B operation

Problem: Crossover distortion, the emitter diode takes 0,7V to turn on.


Fig. 10-5: Crossover distortion

Efficiency: 78.5%

Distortion: High

Application: High power stages, not used in audio applications.

to previous section to next section

[Ukrainian]  [English]  [Russian]