3 Replies Latest reply on Jul 21, 2013 6:10 AM by DaKn_263916

    Suggestions for development of a signal conditioner

      Hello everyone,

      Anyone here have prior experience in development of a signal conditioner in Psoc Creator ? Actually, the main components which I have to implement are a filter and a instrumentation amplifier. I would be very pleased, if anyone could point me in the right direction. I'm a really a beginner in Psoc Creator enviroment.

      Thanks in Advance

        • 1. Re: Suggestions for development of a signal conditioner
          JoMe_264151

          Hi Rladeira, welcome in the fascinating world of PSoCs!

             

          PSoC3, or 5 contain only digital filters and no instrumental amplifier at first sight. Depending on your requirements (Voltages, frequency, noise) you may use an external amplifier or you build one with the opamps contained in the PSoC.

             

          Nevertheless there are LPFs but their use is a bit limited.

             

           

             

          Another choice would be to go with a PSoC1 which has got internal analog filters, amplifiers which could be used as instrumentation amps and ADC. The downgrade is speed and debug capabilities which are inherent for PSoC3,4,5 evaluation Kits but for PSoC1 only with an In-Circuit-Emulator (ICE-Box).

             

           

             

          Bob

          • 2. Re: Suggestions for development of a signal conditioner
                    Recently, We discused with Instrumentation amp for PSoC3 and 5.   
            Please look and see.   
            [ http://www.cypress.com/?app=forum&id=2232&rID=46467 ]   
            • 3. Re: Suggestions for development of a signal conditioner
              DaKn_263916

              The importance of the IA in a design is crucial. One can "easily" delude oneself

                 

              into thinking I have a 20 bit A/D, all is good, when in fact the IA is the front end

                 

              and source of most of the errors in high resolution/precision/accuracy designs.

                 

               

                 

              Read the thread carefully PSoC73 mentioned, as it shows a lot of NON WORKABLE

                 

              suggestions.

                 

               

                 

              Your choice to get a "reasonable" IA out of PSOC is to use -

                 

               

                 

              1) A/D in diff mode, but it is limited as to its input buffer G choices.

                 

               

                 

              2) Use OpAmps in PSOC + precision external R network. This is "OK" at DC, but

                 

              if you need AC performance is compromised by phase delay matching, and layout.

                 

               

                 

              3) Use external IA. from the likes of NSC, TI, Analog Devices.

                 

               

                 

              This might help, well worth the read -

                 

               

                 

              www.analog.com/en/content/cu_dh_designers_guide_to_instrumentation_amps/fca.html

                 

               

                 

              Regards, Dana.