Instrumentation Amplifier Errors and Common Mode Analysis

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ETRO_SSN583
Level 9
Level 9
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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

   

cells..........

   

 

   

   

 

   

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

   

differences.

   

 

   

Regards, Dana.

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ETRO_SSN583
Level 9
Level 9
250 likes received 100 sign-ins 5 likes given

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.

   

 

   

Regards, Dana.

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