A transistor is an arrangement obtained by growing a thin layer of one type of semiconductor between two thick layers of other similar type semiconductor.
Types of Transistors
�
The left side semiconductor is called emitter, the right side semiconductor is called collector and the thin middle layer is called base.
� Emitter is highly doped and base is feebly doped.
� A transistor can be utilized as an amplifier and oscillator but not a rectifier
� Maximum amplification is obtained in common-emitter configuration.
Transistor as an Amplifier
An amplifier is a device which is used for increasing the amplitude of variation of alternating voltage 01 ′ current or power.
The amplifier thus produces an enlarged version of the input signal.
The general concept of amplification is represented in figure. There are two input terminals for the signal to be amplified and two output terminals for connecting the load; and’ a means of supplying power to the amplifier.
1. In Common Base Amplifier,