• Introduction

In today’s article, we are going to study about ‘ configuration of transistor ‘ How beneficial it is and what is theory of configuration of transistor. And hence We will also read about some more topics like common base configuration, common emitter configuration, common collecter configuration, Input characteristic curve Of transistor, output characteristics Curve of Transistor, saturation region, cutoff region, active region etc given in Detail.  So, take your notebooks in you hand and get ready to study physics in an easy and sorted way.

Configuration of Transistor

A Transistor can be connected by three configuration in the circuit-

  1. Common base configuration
  2. And Common emitter configuration
  3. Common collecter configuration

1. Common base configuration

 

In this configuration base terminal is used as common terminal for Input and output. The input signal is applied between emitter terminal and base terminal and output signal is connected at base terminal.

2. Common emitter configuration

In this configuration emitter terminal is used as common terminal for Input and output terminal. This configuration is mostly used for amplification purpose.

3. Common collecter configuration

In this configuration Collecter terminal is used as common terminal for input and output terminal.

Characteristics curve of common emitter configuration

In these Curves we will study about input and output current and voltage relation.

Input characteristic curve

A graph between input current (IB) and VBE plotted at fix output voltage (VCE) is known as Input characteristic curve.

ri= (ΔVBE / ΔIB) VCE constant

Output characteristics curve of transistor

For common emitter configuration the output characteristics graph is drawn between output voltage VCE and output current IC for a fix input current value. We have found that when we increase output voltage then output current is increased linearly with output voltage for very small value.

The above graph has three regions-

  1. Saturation region– In this region the both functions are in forward bias. In this region output current is linearly increased with output voltage. This region is not used for amplifier operation because in this region the output current do not depend on Input current. This region is used as switching purpose of Transistor.
  2. Cut offs region– In this region both functions are in reverse bias and this region is obtained below the IB= 0.
  3. Active region– This region is useful region for amplifier application of Transistor. In this region emitter and base function are in forward bias and Collector and emitter function is in reverse bias. In this region the output current depends upon input current value. And output current does not change with output voltage.

Output resistance (ro)-  (ΔVCE/ ΔIC)IBconstant

It is defined as the ratio of change of Collector-emitter voltage (ΔVCE) to the Change in the collector current (ΔIC) at the constant base current IB.

Conclusion

So our article is finished and after completely reading this article, one can easily tell what is configuration of transistor. And we have also discussed some more topics configuration of transistor, common base configuration, common emitter configuration, common collecter configuration, Input characteristic curve Of transistor, output characteristics Curve of Transistor, saturation region, cutoff region, active region etc.

‌So one can say that they got a detailed information about configuration of transistor and basic information about other topics.

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