Contents
Is transistor used for amplification?
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit.
Where are transistors used as amplifiers?
Applications of Transistor as an Amplifier It can be used in long-distance communication because the intensity of the signal obtained at the output will be high. 2. In the radio signals amplification, these transistor amplifiers are utilized.
Which of the following operation transistors act as amplifier?
The bipolar junction transistor (BJT) plays the role of the current-controlled amplifier, the field-effect transistor (FET) plays role of the voltage-controlled amplifier. In the non-linear mode transistors act as current-controlled and voltage-controlled switches (below).
How is a transistor used to amplify an electrical signal?
A transistor may serve various functions but basically it is used to amplify an electrical signal. Figure 1 gives the basic circuit of a PNP transistor amplifier in common base (CB) configuration. However, we may use an NPN transistor and get the same results.
How is the action of a transistor biased?
In figure 1, the transistor is biased for active region operation i.e. J E is forward biased using voltage source V EE and J C is reverse biased using voltage source V CC. The emitter to base circuit forms the input side of the amplifier while the collector to base circuit forms the output side.
What is the output resistance of a transistor amplifier?
Output Resistance The output resistance of a transistor amplifier is very high. The collector current changes very slightly with the change in collector-emitter voltage. By definition, it is the ratio of change in collector-emitter voltage (ΔV CE) to the resulting change in collector current (ΔI C) at constant base current.
How are the base and collector of a transistor alike?
The base is much thinner than the emitter while the collector is wider than both. However for the sake of convenience the emitter and collector are usually shown to be of equal size. (ii) The emitter is heavily doped so that it can inject a large number of charge carriers into the base.