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Definition of "Active Filter" |
Any filter using an op amp is called an active filter. / A filter that uses an amplifier in addition to passive components. For example an Active Low Pass Filter Circuit. / 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. / a filter that uses an amplifier in addition to reactive components to pass or reject selected frequencies. |
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