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- Active_filter abstract "An active filter is a type of analog electronic filter that uses active components such as an amplifier. Amplifiers included in a filter design can be used to improve the performance and predictability of a filter, while avoiding the need for inductors (which are typically expensive compared to other components). An amplifier prevents the load impedance of the following stage from affecting the characteristics of the filter. An active filter can have complex poles and zeros without using a bulky or expensive inductor. The shape of the response, the Q (quality factor), and the tuned frequency can often be set with inexpensive variable resistors. In some active filter circuits, one parameter can be adjusted without affecting the others. Using active elements has some limitations. Basic filter design equations neglect the finite bandwidth of amplifiers. Available active devices have limited bandwidth, so they are often impractical at high frequencies. Amplifiers consume power and inject noise into a system. Certain circuit topologies may be impractical if no DC path is provided for bias current to the amplifier elements. Power handling capability is limited by the amplifier stages.Active filter circuit configurations (electronic filter topology) include: Sallen-Key, and VCVS filters (low sensitivity to component tolerance) State variable filters and biquadratic or biquad filters Dual Amplifier Bandpass (DABP) Wien notch Multiple Feedback Filters Fliege (lowest component count for 2 opamp but with good controllability over frequency and type) Akerberg Mossberg (one of the topologies that offer complete and independent control over gain, frequency, and type)Active filters can implement the same transfer functions as passive filters. Common transfer functions are: High-pass filter – attenuation of frequencies below their cut-off points. Low-pass filter – attenuation of frequencies above their cut-off points. Band-pass filter – attenuation of frequencies both above and below those they allow to pass. Notch filter – attenuation of certain frequencies while allowing all others to pass.Combinations are possible, such as notch and high-pass (in a rumble filter where most of the offending rumble comes from a particular frequency). Another example is an elliptic filter.↑ 1.0 1.1 ↑".
- Active_filter thumbnail Sallen-Key_Highpass_Example.svg?width=300.
- Active_filter wikiPageExternalLink spexpert.htm.
- Active_filter wikiPageExternalLink ssexpert.htm.
- Active_filter wikiPageExternalLink filterwizard.
- Active_filter wikiPageExternalLink AN-779.pdf.
- Active_filter wikiPageExternalLink articles.htm.
- Active_filter wikiPageExternalLink Filters.html.
- Active_filter wikiPageID "466096".
- Active_filter wikiPageRevisionID "604940505".
- Active_filter hasPhotoCollection Active_filter.
- Active_filter subject Category:Analog_circuits.
- Active_filter subject Category:Linear_filters.
- Active_filter type AnalogCircuits.
- Active_filter type Artifact100021939.
- Active_filter type Circuit103033362.
- Active_filter type Device103183080.
- Active_filter type ElectricalDevice103269401.
- Active_filter type Filter103339643.
- Active_filter type Instrumentality103575240.
- Active_filter type LinearFilters.
- Active_filter type Object100002684.
- Active_filter type PhysicalEntity100001930.
- Active_filter type Whole100003553.
- Active_filter comment "An active filter is a type of analog electronic filter that uses active components such as an amplifier. Amplifiers included in a filter design can be used to improve the performance and predictability of a filter, while avoiding the need for inductors (which are typically expensive compared to other components). An amplifier prevents the load impedance of the following stage from affecting the characteristics of the filter.".
- Active_filter label "Active filter".
- Active_filter label "Filtr aktywny".
- Active_filter label "Filtre actif".
- Active_filter label "Filtro activo".
- Active_filter label "Filtro ativo".
- Active_filter label "Filtro attivo".
- Active_filter label "Активный фильтр".
- Active_filter label "アクティブフィルタ".
- Active_filter sameAs Ενεργά_Φίλτρα.
- Active_filter sameAs Filtro_activo.
- Active_filter sameAs Filtre_actif.
- Active_filter sameAs Filter_aktif.
- Active_filter sameAs Filtro_attivo.
- Active_filter sameAs アクティブフィルタ.
- Active_filter sameAs Filtr_aktywny.
- Active_filter sameAs Filtro_ativo.
- Active_filter sameAs m.02cwtl.
- Active_filter sameAs Q557211.
- Active_filter sameAs Q557211.
- Active_filter sameAs Active_filter.
- Active_filter wasDerivedFrom Active_filter?oldid=604940505.
- Active_filter depiction Sallen-Key_Highpass_Example.svg.
- Active_filter isPrimaryTopicOf Active_filter.
