3 Replies Latest reply on Oct 16, 2013 6:02 AM by junichi.hiraoka

    How about Phase Comparator

    junichi.hiraoka

           

                  

         

      Hello Friends     

       

         

      This time, I am starting the work of Phase Comparator     

       

         

      It is very just an experimental design.     

       

         

           

                  

         

      What is use it for?     

       

         

      Phase detector for PLL     

       

         

      Frequency comparator for FLL     

       

         

      Clock synchronization     

       

         

           

                  

         

      With my DDS ...     

       

         

      Vector Voltage Measurement     

       

         

      Automatic Universal Bridge     

       

         

      Tuning machine for musical instruments ?      

       

         

            

       

         

      Theory of operation     

       

         

           

                  

         

                    PhDet1.JPG            

       

         

      This logic come from 4046 type TTL, PLL device.     

       

         

      That TTL has 3 type phase detectors.     

       

         

      PC1 is exclucive-or method     

       

         

      PC2 is edge detected method     

       

         

      PC3 is RS-flip-flop method     

       

         

      Each has each characteristic.     

       

         

           

                  

         

      PC2 has a feature different with others.     

       

         

      It have wide lock-in range and available to     

       

         

      frequency detection not only phase-range.     

       

         

           

                  

         

                    PhDet2.JPG            

       

         

           

                  

         

      This is quite getting started now,     

       

         

      Has many unstable behavior still     

       

         

      I'm not certain that can use at actually.     

       

         

           

                  

         

      Thank you