AC Filter Networks Different Type of Filters
In this article we have explained the AC Filter Networks Different Type of Filters.
AC filter networks Different Type of Filters are divided into two major categories:
(i) active networks and
(ii) passive networks.
Active filter networks usually contain transistors and/or operational amplifiers in combination with R, L and C elements to obtain the desired filtering effect. These will not be discussed in this book. We will consider passive filter networks only which usually consist of series-parallel combinations of R, L and C elements. There are four types of such networks, as described below:
1. Low-Pass Filter. As the name shows, it allows only low frequencies to pass through, but attenuates (to a lesser or greater extent) all higher frequencies. The maximum frequency which it allows to pass through, is called cutoff frequency fc (also called break frequency). There are RL and RC low-pass filters.
2. High-Pass Filter. It allows signals with higher frequencies to pass from input to output while rejecting lower frequencies. The minimum frequency it allows to pass is called cutoff frequency fc. There are RL and RC high-pass filters.
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3. Bandpass Filter. It is a resonant circuit which is tuned to pass a certain band or range of frequencies while rejecting all frequencies below and above this range (called passband).
4. Bandstop Filter. It is a resonant circuit that rejects a certain band or range of frequencies while passing all frequencies below and above the rejected band. Such filters are also called wave traps, notch filters or band-elimination, band-separation or band rejection filters.
Read article – Units of Resistivity
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