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Active Butterworth filter

Active Butterworth filter
Active filters are invariably designed with a unity-gain buffet. In fact, this has become such a habit that one is inclined to think that it is obligatory, which of course it is not. An arrive filter can easily be designed with an amplifier without making it less accurate. This has real benefits for in many cases it means that an entire stage may be omitted from the relevant amplifier.
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