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Analog Electronics Lecture 2_PartB_BJT configurations & modes

Module by: Bijay_Kumar Sharma. E-mail the author

Summary: Abstract: This describes three circuit configurations, four modes of operation and five schemes of biasing;

Analog Electronics Lecture 2_PartB_BJT configurations & modes

Key words;CE,CC & CB BJT;

Abstract: This describes three circuit configurations, four modes of operation and five schemes of biasing;

BIPOLAR JUNCTION TRANSISTOR

FOUR MODES OF OPERATION

Table 1
Type Of Biasing Emitter-Base Junction Base-Collector Junction
Forward Active Mode Forward Biased Reverse Biased
Inverse Active Mode Reverse Biased Forward Biased
Saturation Mode Forward Biased Forward Biased
Cut-Off Mode Reverse Biased Reverse Biased

THREE CIRCUIT CONFIGURATIONS

  1. (1) COMMON BASE CONFIGURATION
Figure 1
Figure 1 (Picture 47.png)

  1. (1) COMMON EMITTER CONFIGURATION
Figure 2
Figure 2 (Picture 3.png)
  1. (1) COMMON COLLECTOR CONFIGURATION

TYPES OF BIASING SYSTEM USED

(1)Two battery biasing:

The 3 circuit configurations shown in the previous page are the examples of this biasing.

(2)Fixed Bias:

This type of biasing system offers poor stability because it has negative feedback..

Figure 3
Figure 3 (Picture 4.png)

(3)Potential Divider Bias:

This type of biasing also offers poor stability because this also has no negative feedback.

Figure 4
Figure 4 (Picture 3.png)

(4)Self Biasing:

This type of biasing system offers high stability because of current series feed-back.

Figure 5
Figure 5 (Picture 2.png)

(5)Widlar Biasing:

The above types of biasing systems are used normally for discrete circuits. But this type of biasing is used for IC technologies. It offers high stability because of voltage shunt feed-back.This is also known as collector to base feed-back.

Figure 6
Figure 6 (Picture 5.png)

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