Hi all,


I'm looking to design a closed loop differential-in, single-ended out unity gain amplifier. It needs to have very good CMRR. One way to design such a circuit is to use an instrumentation amplifier. However, an instrumentation amplifier drives resistive loads in the first stage, making it a little power hungry. I found such a circuit can also be designed using a differential difference amplifier with feedback.

Does anybody have any experience with this circuit? How does it compare to a normal op-amp in unity-gain feedback in terms of accuracy. Alternatively, does anybody know of other good options?

Any feedback is appreciated.


thanks,
Aaron

Thanks for the reply.


Yeah I've read that paper. Its interesting. I've just got this feeling that I'm not going to get the same kind of performance as a typical opamp in feedback. I guess I need to do some analysis.


thanks,
Aaron

Hi,


do you have any specific questions? I referred to a paper in ieeexplore. Just search for Differential Difference Amplifier...


Aaron

Hi shaikss_rf,


I suggest you attach the images directly to the post, instead of using a zip file.


Aaron