Its a good idea, for the following reasons, to use an external IA when need arises
to eliminate CM signals, such as pressure transducer, strain gauge bridges. Load
If you need model to compute your own design let me know. Note you need Matlab
to evaluate. Note with model you can eval Aol differences as well as closed loop G
Change in model to eliminate loging errors due to - values at input to logger -
Note with the Aol differences, and a 1% difference in closed loop G, the CMR
falls to 26 db, thats ~ 4 bits, 1 LSB.