Answer to Question #255298 in Electrical Engineering for Lol

Question

Explain the general ac equivalent circuit operation conditions of Common Emitter

Fixed Biased Amplifier configuration as shown in Figure Q1.

Answer 1

Transistor amplifier’s amplify an AC input signals that alternates between some positive value and a corresponding negative value. Then some way of “presetting” the amplifier’s circuit configuration is required so that the transistor can operate between these two maximum or peak values. This can be achieved using a process known as Biasing.

Biasing is very important in amplifier design as it establishes the correct operating point of the transistor amplifier ready to receive signals, thereby reducing any distortion to the output signal.

Also, the use of a static or DC load line drawn onto the output characteristics curves of an amplifier allows us to see all the possible operating points of the transistor from fully “ON” to fully “OFF”, and to which the quiescent operating point or Q-point of the amplifier can be found.