0 Replies Latest reply on Jun 27, 2013 3:49 PM by user_14586677

    Instrumentation Amplifier

    user_14586677

      A suggestion to Cypress for customers who need IA's -

         

       

         

      1) If designer wants to use PGA in a 2 or 3 OpAmp configuration needed

         

      is a spec for PGAx/PGAy gain ratio, as this affects CMR of the IA. Now you have

         

      gain error for PGA, but I would bet that PGA to PGA ratio tracking is much better

         

      than the G error specs.

         

       

         

      2)  The same would be true for the AC specs, GBW, ratio one PGA to another.

         

       

         

      3) PGA bias current specs and drift.

         

       

         

      4) For users that want to implement with OpAmps and external precision R array,

         

      specs on bias current and drift and GBW ratio OpAmp to OpAmp. This is crude,

         

      better yet would be pole-zero specs, and ratio OpAmp to OpAmp.

         

       

         

      Regards, Dana.