I was reading paragraph 4.2 of this book about Active RC filters.
It says that if we want to get a band pass filter with high selectivity (i.e. high quality factor Q) we should use resonant circuits (like RLC circuits). But, since high inductances are difficult to realize in integrated circuits, this solution cannot be used in many situations, and the alternative is that of using some active components (like Op - Amp or OTA).
What I do not understand is: why does the presence of active components guarantee sharp filter shapes (as a resonant circuit with high Q)?