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