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Several low pass prototype filters are the basis for designing filters based on modern network synthesis. All kinds of low pass, high pass, band-pass and band stop filters are derived from this characteristic. Because of this, the design of the filter is simplified and the precision is improved.
The ideal low-pass filter should be able to make all below the cut-off frequency of the signal through the lossless and all higher than the signal, the cut-off frequency should be infinite attenuation, thus presenting a rectangle in the amplitude frequency characteristic curve, so called rectangular filter (brick-wallfilter). Unfortunately, such an ideal feature can not be realized, and all the designs are merely a feature that attempts to approach the rectangular filter. According to the difference of the selected approximation functions, different responses can be obtained. Although the approximation function is varied, the "Butterworth response" or "Chebyshev response" is usually chosen in consideration of the use of the actual circuit.
The "Butterworth response" bandpass filter has a flat response characteristic, while the Chebyshev response bandpass filter has a steeper attenuation characteristic. So the specific selection of the characteristics needs to be determined according to the specific requirements of the circuit or system. However, the Chebyshev response filter is the most insensitive to component changes, and has good selectivity and good standing wave characteristics (located in the middle of the passband). Therefore, in general applications, Chebyshev response filter is recommended. Main classification
According to the signal processed, it is divided into two kinds: analog filter and digital filter.It is divided into four types: low pass, high pass, band pass and band stop filter, according to the frequency band of the signal.
Low pass filter: it allows low frequency or direct current component in the signal to suppress high frequency components or interference and noise.
High pass filter: it allows the high frequency component of the signal to pass through, to suppress low frequency or direct current component;
Bandpass filter: it allows a signal to pass through a certain frequency band to suppress signals, interference and noise that is lower or higher than that of the frequency band. Bandstop filter: it inhibits a signal in a certain frequency band and allows signals beyond the band to pass through.
The components are divided into two kinds of passive and active filters according to the components used.
Passive filter: a filter consisting only of passive components, which is made up of the principle that the reactance of capacitance and inductance changes with the change of frequency. The advantage of this type of filter is that the circuit is relatively simple, does not require a DC power supply, high reliability; the disadvantage is: band signal energy loss, load effect is obvious, easy to cause the use of electromagnetic induction inductor, inductance when large L filter volume and weight are large, do not apply in low frequency domain.
Active filter is composed of passive and active components. The advantage of this type of filter is: band signal not only energy loss, but also can be enlarged, the load effect is not obvious, multi connected mutual influence is very small, very easy to use simple method of cascade consisting of high order filter, and the filter has the advantages of small size, light weight, need magnetic shielding; the shortcoming is: the pass band range of active devices need bandwidth limit, DC
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Last Update : Jan 13, 2018
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