Collector Feedback Bias-Basic Electronics Biasing-Lecture Slides, Slides for Basic Electronics. Aliah University
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sweeto13 July 2012

Collector Feedback Bias-Basic Electronics Biasing-Lecture Slides, Slides for Basic Electronics. Aliah University

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Jagmeet Chatterji delivered this lecture at Aliah University for Basic Electronics course. Its main points are: Collector, Feedback, Bias, Stability, Sensitivity, Analysis, Emitter-base, Loop, Approximation, Configuratio...
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Basic Electronic Engineering

Basic Electronic Engineering

Lecture 16

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Collector Feedback Bias

• Stability of a bias circuit can be improved by introducing a feedback path from collector to base

• The sensitivity to changes in beta and temperature is less compared to fixed bias and emitter bias circuits

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Analysis of Collector Feedback Bias Circuit

Emitter-Base Loop

Applying the approximation CC C C B B BE E EV I R I R V I R   

C E C BI I I I   

CC B C B B BE B EV I R I R V I R    

  CC BE

B B C E

V VI R R R 

  

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Collector-Emitter Loop

Approximating

Analysis of Collector Feedback Bias Circuit

CC C C CE E EV I R V I R  

C E CI I I  

CC C C CE C EV I R V I R  

 CE CC C C EV V I R R  

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Collector Feedback Bias

• Example Find ICQ and VCEQ for the following circuit

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Common Collector Configuration

• Collector terminal is connected to ground

• Output voltage is taken from the emitter terminal

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Common Collector Configuration

Emitter-Base Loop Applying KVL

EE B B BE E EV I R V I R  

 1E BI I 

 1EE B B BE B EV I R V I R   

 1 EE BE

B B E

V VI R R 

  

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Common Collector Configuration

Collector-Emitter Loop Applying KVL

EE CE E EV V I R 

CE EE E EV V I R 

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Common Collector Configuration

Find IEQ and VCEQ for the following bias circuit

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Common Base Configuration

• For common base configuration the input signal is connected to the emitter and base is at ground potential

• Base is common between the input terminal(emitter) and output terminal(collector)

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Common Base Configuration

Base-Emitter Loop • Applying KVL in the loop

EE E E BEV I R V 

EE BE E

E

V VI R 

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Common Base Configuration

Collector-Emitter Loop • Applying KVL in the loop

EE CC C C E E CEV V I R I R V   

C EI I

EE CC E C E E CEV V I R I R V   

 CE EE CC E C EV V V I R R   

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Common Base Configuration

Collector-Base Loop • Applying KVL in the loop

CC CB C CV V I R 

CB CC C CV V I R 

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Common Base Configuration

Find IE IB VCE and VCB for the following circuit

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