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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
close this folderLesson 6 - Transistor Biasing II
close this folderLesson Plan
View the documentTransistor biasing II
View the documentVDB analysis
View the documentWorksheet No. 6
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
 

Transistor biasing II

Voltage Divider Bias

The most famous circuit based on -the prototype of emitter bias is called the voltage divider bias (VDB).

Recall the steps of analyzing the emitter bias circuit:

1. VE
2. IE
3. IC
4. Voltage drop across RC
5. VC
6. VCE[SFARSIT]

The three most important steps are:

[inceput284]1. IE
2. VC
3. VCE


Fig. 6-1: Emitter biased circuit

Problem: Sometimes the voltage from the VCC power supply is too large to apply directly at the base.

Solution:

- extra power supply for the base
- or ==> VDB


Fig. 6-2: VDB circuit

The voltage drop across R2 is applied directly to the base, which means:

V2 = VB
1. step: find voltage drop across R2
2. step: subtract 0.7V to get VE
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