Advantages and disadvantages of passive filters

Filtering circuits are more important to many electronics designs because they remove unwanted frequencies. They are popular form because they do not need a power supply and depend on passive components rather than active components. This post gives information about the advantages and disadvantages of passive filters to better understand this topic.

Advantages of passive filters:

  • It is reliable
  • They can handle large voltage currents and power
  • There is no limitation on the frequency range
  • They do not need the additional dc power supply for their operation
  • Easy to design
  • Cheaper as compared to active filter
  • No amplifying elements
  • Require no power supply
  • High frequency

Disadvantages of passive filters:

  • Response problems
  • Tuning for fixed frequency
  • Fixed reactive power compensation
  • Large in size
  • There is no isolation between input and output
  • The circuit becomes bulky if inductors are used
  • There is always some loss of signal it can be in the passband
  • This circuit can not provide any gain
  • Source loading can take place
  • There is no clear demarcation between passband and stopband but actually, it gets mixed up
  • In this frequency response is not sharp since when switching from passband to stopband there is no sudden change in output.