2 Replies Latest reply on May 2, 2014 5:01 AM by user_14586677

    signal conditioning

    tayyaba.azmat

      A sinusoid having amplitude 100mv and frequency 1khz is an input from function generator to PSOC. Using capacitive buttions, I want that after reset, amplitude become 0 volt; by pressing positive button amplitude increase by 100mv and negative button will decrease amplitude by 100mv. Moreover, using slider at 50% position, the offset will become zero; at 0% position, offset become -1 volt, and at 100 %, the offset is +1volt. The output should be shown on oscilloscope. How this can be accomplished using PSOC3?

        • 1. Re: signal conditioning
          user_14586677

          Basically you would use a DAC as the offset to an OpAmp summer that

             

          is passing the generator signal. This would be an offset between

             

          ground and Vdd, so now you have to use 1 external OpAmp with a

             

          negative supply and a fixed offset to shift the PSOC developed signal

             

          so it is symmetrical about ground. This is nothing more than another

             

          summer, but external.

             

           

             

          There are a number of ways to develop - supplies, see attached, as

             

          well as various charge pumps, switchers, etc.. TI, NSC, Philips, On,

             

          Fairchild.....

             

           

             

          Regards, Dana.

          • 2. Re: signal conditioning
            user_14586677

            You might also look at audio amps, as they have a power output stage,

               

            thermally and current protected, are consumer cheap, and have OpAmp

               

            like front ends in many versions.

               

             

               

            Regards, Dana.