2 Replies Latest reply on Aug 29, 2012 5:26 PM by user_14586677

    Filter Wizard

    user_14586677

      The nomenclature on plots is confusing.

         

       

         

      "Nominal" should be changed to "desired" or "ideal"

         

       

         

      "Expected" should be changed to "PSOC actual" or "PSOC result".

         

       

         

      Regards, Dana.

        • 1. Re: Filter Wizard
          seg

          Dana:

             

          The vocabulary is a problem.

             

          "Ideal" is in the eye of the beholder. I'll still think "nominal" is the most accurate description. 

             

          "Expected" is what you expect to get using the available capacitor ratios. Note that the attenuation on the high frequency side is not quite down to the "nominal" level. "PSoC actual" is a better choice, as long as the user accepts that there may be some small variation from the curve. I'll change it in the next release.

             

          ---- Dennis

          • 2. Re: Filter Wizard
            user_14586677

            "ideal" is a direct result of defining transfer function, its pole/zero locations, etc.. When one

               

            speaks of Butterworth, Cheby, Elliptiec there is generally speaking a universal understanding

               

            of what will result, response curves, impulse response, phase, etc.. of the ideal components.

               

             

               

            So I think the "eye of the beholder" analogy should not apply to a textbook response

               

            of ideal components, which pretty much is all the available software filter design tools

               

            basis. Spice excepted of course, where one can model the non ideal behaviour of

               

            components, escpecially caps.

               

             

               

            Regards, Dana.