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Your assignment is to prepare and submit a paper on designing, implementing and testing a timer.
Your assignment is to prepare and submit a paper on designing, implementing and testing a timer. The output transistors conduct regardless of the waveform of the output signal. The amplifier is highly applicable to areas demanding high linearity because of its high liner feature. However, low frequency and power inefficiency is the main drawback for class A amplifiers.
Class B amplifiers utilize push-pull topology. They incorporate negative and positive transistors and each transistor contributes to input replication by conducting during half of the received signal, which makes Class B current efficient. Class B amplifiers are more efficient compared to class A and were developed as a remedy to efficiency and heating problems in class A amplifiers. Class B amplifiers are characterized by the high frequency that degrades the audio signal quality. This results from a cross-over point where two transistors transit from ON to OFF states. When the transistor is dealing with extremely low signals, crossover distortions can be experienced. Consequently, class B amplifiers have poor performance rates in low power gadgets.
Class AB combines features of class A and B amplifiers. They integrate sound quality and efficiency provided by class A and B amplifiers respectively. The integration of these features is made possible by making both transistors biased so that they can conduct a signal near zero. Upon the application of small signals, the two transistors will be activated and the amplifier will function in a similar way as class A amplifier. On the other hand, the application of large-signal will render one transistor inactive, making the amplifier to operate as a class B amplifier. Class AB topologies are characterized by high SNR and low THD+N. Their efficiency is usually rated at about 65 percent. Class AB amplifiers are used for devices that require high fidelity such as tablets, portable media players, and cameras among others. Class AB amplifier with its input and output waveforms is as shown in figure 1.2 below.
