brief introduction： :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 active filter can have complex poles and zeros without using a bulky or expensive inductor. Active filters use amplifiers (op-amps) to create the appropriate filtering effect and pr

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