what if one filter is not enough for a circuit?

AlbertHall

Joined Jun 4, 2014
12,346
Multiple filters, multiple pole filter(s).
For instance, a power supply rail may have a large(ish) electrolytic capacitor to smooth out slow changes in the supply voltage. The performance of electrolytic capacitors degrades quite quickly as the frequency increases so then there is a lower value (perhaps) ceramic capacitor to filter the higher frequencies.
 
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