For many analog-to-digital converter (ADC) applications, a simple passive resistor/capacitor (RC) filter at the buffer input will provide adequate antialiasing filtering. However, an active filter is often needed for higher-resolution, low-noise applications that require higher-order filtering. The active component in that filter must have sufficient bandwidth, fast settling time, low noise, and low offset voltage so that it doesn’t corrupt the signal before it gets to the ADC.
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