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Broad band amplifiers are amplifiers which will reproduce a wide range of signals without significant loss throughout the pass band. A typical broad band amplifier is a mast head amplifier erected on a TV mast and designed not only to amplify VHF and UHF TV signals but also to establish a low noise figure. Not all broad band amplifiers are that wide so we will consider some examples here.
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Broad band amplifiers can be designed either with or without broad band transformers. A typical example without broad band transformers is shown in figure.
Now some very interesting things occur here. Firstly the amplifier is broad band by nature and the bandwidth would be a function of the transistors used. We would not take the expression broad band too literal here. Certainly we would expect several Mhz bandwidth centred around say 20 Mhz. Not exactly a TV mast head amplifier but it would certainly operate quite well at lower frequencies down to audio.
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