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<p>An active filter is a type of analog circuit that implements an electronic filter to a signal using active components such as an amplifier. When an amplifier is included in a filter design or application, it can improve the predictability and performance of the filter.</p><h3>Types of Active Filters</h3><ul><li>Brand Pass Filters</li><li>Brand Reject Filter</li><li>High Pass Filter</li><li>Low pass Filter</li><li>Quad Filters and Universal Filters are devices that can be programmed to perform one of the other types of active filters</li><li>Notch Filter</li></ul>

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