In this way, the various classes of the amplifiers are designed and discussed. This type is used for frequency modulation of the signals which are required for FM transmissions. Other than the considered frequency rest of the frequency signals are suppressed.

It consists of the tuning load through which the input signals are filtered and amplified. It is preferred in the oscillators that have frequency consisting high in range. The corresponding transistor gets ON when the respective halves are amplified and thereby the overall signal gets amplified.Īs the signal generated from this circuit is of maximum distortion it cannot be preferred for the amplification of the audio signals. Therefore one half of the cycle that is positive cycle is amplified by one transistor and the remaining half that is the negative cycle is amplified by the second transistor. The angle of conduction for these kinds of class amplifiers is 180 degrees. Rather than using the single transistor, in this circuit it is designed with the help of the two transistors( one NPN and other PNP) that complement each other. To overcome the drawback of the unnecessary heating of the device class B circuit of the power amplifier was designed. The distortion in this type of amplifier is said to be minimum which results in better performance. The angle of conduction for this class of amplifier is considered to be 360 degrees. It also requires a heat sink to absorb the heat dissipated by the circuit. Since the transistor is active for both the half cycles it dissipates lots of heat and this results in the decrease in the overall efficiency of the circuit. The drawback of this circuit is that the transistor present in this circuit remains always on as it conducts in both positive and negative cycle of the input signal.

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