8
BJT Amplifiers
8.1 Introduction
The word amplifier means a circuit that boosts the amplitude of the input signal retaining its other parameters, i.e. frequency and phase. The amplifiers are classified in many ways. The following inherent characteristics can be used for classifying them:
- Frequency range of operation (audio, radio, video)
- Duration of conduction angle
- Input signal magnitude
- Types of output signal
- BJT configurations
- Interstage coupling, etc.
8.1.1 Frequency Range of Operation
The range of frequency of operation of any amplifier specifies a particular frequency range within which it can work. The following frequency ranges can be used to describe the name of a particular amplifier:
- audio range (20 Hz to 20 kHz)
- radio range (few ...
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