ECG Analysis

Discussion in 'The Projects Forum' started by ravi23071988, Nov 10, 2011.

  1. ravi23071988

    Thread Starter New Member

    Nov 10, 2011
    2
    0
    Can anyone tell me how to reject the power line noise from the signal...
    the signal is to weak to detect.
    Can someone please suggest me about the best OPAM to work with..
    PLEASE HELP!!!!!!!!!! its urgent.....:confused::confused::confused::confused:
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    Post your schematic.

    Ken
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You need to use an instrumentation amplifier, you should use twisted shielded pair cables for the signal input, and you may need to drive the shield so that it has an active ground.

    You really can't filter out the 60Hz noise from the signal once it gets in there; as 60Hz is too close to the subjects' heartbeat frequency. Make certain that there is no noise on your power supply. Batteries have a very, very low amount of noise; consider using batteries for a supply.

    An INA118 or INA128 might be a good choice for an instrumentation amplifier to use.

    [eta]
    Have a look at the datasheet for the INA128:
    http://www.ti.com/lit/ds/symlink/ina128.pdf
    On the bottom of page 11, there is an application shown for an ECG amplifier with a driven shield and a driven ground for the patient.
    The INA118 datasheet has the same application in the same location:
    http://www.ti.com/lit/ds/symlink/ina118.pdf
     
    Last edited: Nov 10, 2011
  4. MrChips

    Moderator

    Oct 2, 2009
    12,414
    3,353
    This is not an easy thing to do. The circuit has to be high impedance differential instrumentation opamp with high CMRR. Also circuitry must be isolated for safety reasons. Use batteries.

    edit: Wookie still types faster than me. At >20K posts he's had more practice.
     
  5. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
  6. ravi23071988

    Thread Starter New Member

    Nov 10, 2011
    2
    0
    thanx for suggesting me
     
Loading...