Comparision of Active and Passive filters


PASSIVE
ACTIVE
Advantages
  • No power supply required
  • Can handle large currents and high voltages
  • Very reliable
  • Least number of components for given filter
  • Noise arises from resistances only
  • No bandwidth limitation
  • No inductors
  • Easier to design
  • High input impedance (Zin), low output impedance (Zout) for minimal loading
  • Can produce high gains
  • Generally easier to tune
  • Small in size and weight
Disadvantages
  • Inductors large for lower frequencies
  • Some inductors (non-toroidal) may require shielding
  • Limited standard sizes, often requiring variable inductors and therefore tuning
  • Low tolerance inductors (1-2%) very expensive
  • Must be designed with consideration to input and output loading
  • Generally not amenable to miniaturization
  • No power gain possible
  • No voltage gain
  • Power supply required
  • Susceptible to inter-modulation, oscillations
  • Susceptible to parasitic from dc output offset voltage and input bias currents
  • Op amp gain bandwidth constrained
  • Op amp slew rate constrained
  • Can require many components

Disclaimer:
The above article doesn't give you any guarantee and the sole purpose of this article is to share my learning in the way I understood. Any comments to refine this article are welcome with great pleasure. Please report any breaking link by commenting below.

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