Matches in DBpedia 2016-04 for { ?s ?p "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 ↑"@en }
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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 ↑".
- Q557211 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 ↑".