what are the main parameters to be considered while selecting instrumentation amplifier for neonatal eeg recording?

The whole idea of using an instrumentation amplifier (IA) is to get high common mode rejection (CMR). This is not constant,, however, as it varies with frequency. Make sure that its input common mode range and output swing will be adequate to cover your requirements-- there is a big difference between two- op amp IAs and three- op amp IAs, especially when operated on single supplies.

Of course the usual IC selection considerations also apply to IAs.

If you check on the internet you might find a draft copy of a book on IAs that I was working on a long time ago. Google search "The Instrumentation Amplifier Handbook- With Applications".

Hello Nisha,

Besides looking at discrete instrumentation amplifiers you also might want to look at fully integrated solutions. The ADS1298 was developed especially for ECG/EEG applications (http://www.ti.com/ww/en/analog/ads1298/index.shtml?DCMP=hpa_ads1298_campaign&HQS=NotApplicable+OT+ads1298v-pr).

Best regards

Thomas

Hi Nisha,

I agree with Thomas and Neil above. 

For ECG and EKG applications you will be looking for an Instrumentation Amplifier with High CMRR, High Input Impedance+Low Input Bias Current, Low Noise, and appropriate bandwidth for your application.

There are a number of ECG/EKG related posts on the forum already with circuits and significant dialogue.  I strongly suggest you search and read through those before you start.

Regards,
Collin Wells
Precision Linear

I'm a bit puzzled ....nowhere did Nisha mention EEG or EKG in his question.

Hello,

Yes, my apologies I got this confused with a similar issue this morning.  Please replace ECG/EKG with EEG. 

Thanks for getting that cleared up.

Regards,
Collin Wells

No, my apologies for missing the clearly spelled out question in the title. My mistake-- sorry.

Hi Neil ,

    the draft copy "The Instrumentation Amplifier Handbook-With Applications" is quite useful for me..thanks

Regards,

Nisha

You are welcome, Nisha. I am glad that it helped.