50 Hz Notch Filter Design

Discussion in 'The Projects Forum' started by mustafapk, Mar 26, 2011.

  1. mustafapk

    Thread Starter New Member

    Oct 16, 2008
    3
    0
    Hello,
    I am working on Biomedical Signal Acquisition from body.
    A basic problem with all these types of signal is that they are of very low amplitude therefore noise comes in it.
    Can anyone guide me how to remove it accurately without having any effect on amplitude and phase of the origional signal.
    Thanks
     
  2. ifixit

    Distinguished Member

    Nov 20, 2008
    639
    108
    Hi,

    Here is an example from Googling ECG amplifier. There are dozens more.

    Good luck with your research,
    Ifixit
     
  3. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    The common mode feedback through A1 and A2 in ifixit's post are key to minimizing line frequency interference picked up by the body.
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    A notch filter at 50hz does not remove the harmonics at 100Hz, 150Hz, 200Hz, 300Hz and dimmer buzz.
     
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