Chapter 4

Amplifiers Using Bipolar Junction Transistors or FET

The most important application of a BJT (bipolar junction transistor), or a FET (field effect transistor) is to act as an amplifier. Each amplifier stage consists of an active device a BJT or a FET, D.C. source, A.C. source and associated circuit components. To understand certain basic amplifier features such as amplification of signals, input and output impedances, frequency response of amplifiers, and so on. Block Box model of an amplifier is discussed initially.

An amplifier can be treated as a two-port network with two terminal pairs; one pair of input terminals and one pair of output terminals. In most of the cases, there is a common terminal between the input and the output ...

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