Contents
What are the applications of CE amplifier?
Common-emitter amplifiers are also used in radio frequency circuits, for example to amplify faint signals received by an antenna. In this case it is common to replace the load resistor with a tuned circuit. This may be done to limit the bandwidth to a narrow band centered around the intended operating frequency.
What is sacrifice factor in amplifier?
The internally generated distortion is reduced by the sacrifice factor. As you can see, large sacrifice factors can drastically reduce distortion. An amplifier with 10% THD and a sacrifice factor of 100 produces an effective distortion of only 0.1%.
Why do we prefer CE configuration only?
Common emitter circuit is preferred over a common base circuit in amplifiers because the resistance of the common emitter circuit is much less than that of the common base circuit. Also the power gain in the common emitter circuit is much higher than that in a common base circuit.
What is the CE amplifier also called?
A CE amplifier is also called circuit. The d.c. load of a transistor amplifier is generally that of a.c. load.
Which is the coupling capacitor in a CE amplifier?
Figure 1 gives the basic circuit of CE amplifier using NPN transistor bias through use of resistor R b. Here capacitor C b1, acts as the coupling capacitor to couple the input signal to the base-to-emitter terminals of the transistor.
How does the common emitter ( CE ) amplifier work?
Thus, capacitor C b1 blocks dc voltage but passes a.c. signal voltage. Similarly, capacitor C b2 serves the same two functions. Thus, C b2 works as coupling capacitor and feeds the amplified a.c. signal to constitute the output voltage V 0 across RL. Simultaneously C b2 blocks the d.c. voltage.
How is the zero signal of an amplifier established?
Amplifier of Fig. 1 uses fixed bias. In this circuit, the zero-signal operating point P 2 may be established by selecting resistance R b such that the base current I B equals the current I B2 corresponding to the zero-signal operating point P 2. Thus, ….. (3)
Why does a common emitter amplifier give 180° inversion?
The common emitter transistor amplifier is the only configuration that gives an inversion, 180°, between the input and output signals. The reason for this can be seen from the fact that as the input voltage rises, so the current increases through the base circuit.