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Analog Filters

Types of Analog Filters

Based on Components Used

  • RC Filters

Based on band filtered

  • Low pass
  • High pass
  • Band pass
  • Band reject
  • All pass

Based on active components

If an active component lke op-amp or transistor is used in RC filter, it is called:

  • Active filter

Uses of Analog Filters

  • Avoid aliasing by ADCs or DACs
    • In ADCs, antialiasing AF ensures i/p signal does not contain any component above the Nyquist frequency.
    • In DACs, the reconstruction analog filter ensures that no dangerous or unwanted frequency components are created by the limited resolution and sampling rate of the DAC.
  • Analog signal modulation for re-transmission
  • Prevention of Signal-to-Noise ratio problems in multiple stage amplification

  • Power Quality Modulation

  • It's an analog world

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