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

 

Hi,

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

Good luck with your research,
Ifixit

 

The common mode feedback through A1 and A2 in ifixit's post are key to minimizing line frequency interference picked up by the body.

 

A notch filter at 50hz does not remove the harmonics at 100Hz, 150Hz, 200Hz, 300Hz and dimmer buzz.