11 Replies Latest reply on Sep 1, 2020 2:19 PM by OsFe_2822791

    Amplifier Simulation

    OsFe_2822791

      Hello everyone,

       

      Is there any Cypress software called Amplifier Simulation or some software which is capable of simulating the differents values of the components in a filter?

       

      Thank you.

        • 1. Re: Amplifier Simulation
          LePo_1062026

          OsFe,

           

          When I want to simulate analog circuits I use LTSpice from Analog Devices Inc.  It's an excellent product and FREE!  (Can't beat that price!)

           

          Here's a link to the download page:  https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html#

           

          I hope this helps.

           

          Len

          • 2. Re: Amplifier Simulation
            OsFe_2822791

            Hello,

             

            thank you for your response. LTSpice it´s a good software, thank you. But I read something about Amplifier Simulation software which is perfect to my aplication. Here you can read it, but I can´t found. https://www.cypress.com/file/362726/download

            • 3. Re: Amplifier Simulation
              LePo_1062026

              OsFe,

               

              Thanks for the link to the AppNote.  This is an old AppNote (circa. 2005) for a PSoC1.  Even if you can find the "Amplifier Simulator", I'm not sure the PGA/Opamp parameters will be the same.

               

              Tomorrow I'll try to interpret the OpAmp parameters from the datasheet to create some LTSpice models.  Then you can create your own simulation circuits.

               

              Which PSoCx are you using?

               

              Len

              • 4. Re: Amplifier Simulation
                OsFe_2822791

                Hi,

                 

                I´m using PSoC 1, specifically CY8C29466. Now I´m trying to make an High Pass Filter with a PGA and two SCBLK simulating the AC Amplifier with Negative Feedback of the previous link (Figure 2).

                 

                Thank you so much.

                • 5. Re: Amplifier Simulation
                  LePo_1062026

                  OsFe,

                   

                  In the meantime, you could contact: Vadym Grygorenko @  vad_gr@ukr.net. if he still uses that address.

                   

                  Len

                  • 6. Re: Amplifier Simulation
                    OsFe_2822791

                    Hi Len,

                     

                    what can I ask Vadym? Thank you.

                     

                    Oscar.

                    • 7. Re: Amplifier Simulation
                      LePo_1062026

                      OsFe,

                       

                      Vadym was the author of the Appnote.

                       

                      It might be that Cypress once distributed the Amplifier sim program but no longer does.  Hopefully Vadym might still have a copy of it.

                       

                      Len

                      • 8. Re: Amplifier Simulation
                        OsFe_2822791

                        Hi Len,

                         

                        I wrote to Vadym but there´s no answer, I'm afraid he doesn't have the program or doesn't use this email. Anyway, do you know if it is possible to simulate the circuit equivalent to Figure 2 of the AppNote in LTSpice?

                         

                        Thank you so much.

                         

                        Regards.

                        • 9. Re: Amplifier Simulation
                          LePo_1062026

                          OsFe,

                           

                          Theoretically yes.  A simulation is only as good as its' models.

                          I'll take a look at creating a reasonable simulation of the PSoC1 PGA component.  I say reasonable because the model will contain many of the elements Cypress reveals in their specification sheet.  Other elements such as internal routing switching resistances and parasitic capacitance are probably not shared with the customer community.  This is why the "Amplifier Simulation" tool (if available) would have been better.  The designer of the tool might have had inside knowledge of these elements.

                           

                          I'll try to create a model with these "hard to get" internal elements as placeholders with nominal values.  You can then adjust them if you wish.

                           

                          Len

                          • 10. Re: Amplifier Simulation
                            LePo_1062026

                            OsFe,

                             

                            I've updated this post today.  It now includes better simulation models.

                             

                            I've attached a set of files to run on LTSpice.

                             

                            To mimic the Figure 2 configuration, open the file AC Amp w_Neg_FB.asc.  All the other files are support for this schematic.

                             

                            Here's a list of the files:

                            FileDescription
                            AC Amp w_Neg_FB.ascThe Figure 1 simulation file
                            AC Amp w_Neg_FB.pltPlot definitions
                            AMPINV.ascAMPINV equivalent circuit
                            AMPINV.asyAMPINV symbol
                            AMPINVTest.ascAMPINV Test Simulation
                            PGA.ascPGA equivalent circuit
                            PGA.asy

                            PGA symbol

                            PGATest.ascPGA Test Simulation
                            PGA and AMPINV Gain or Loss.xlsxPGA and AMPINV gain/loss worksheet

                             

                            Here's a snip of the sim circuit.

                            Here is a plot output of this file's AC simulation.

                            Here is a snip of the AC gain analysis from the App Note:

                            The two Gain Frequency responses are nearly exact.

                             

                            It is not 'perfect' to the PSoC but this simulation can be modified to prove out your concepts.

                             

                            It uses a generic ADI AD820 Opamp (not necessarily PSoC1 specs) as a starting point.

                             

                            These models might not be fully PSoC1 but are a good starting point for your analysis.

                             

                            Len

                            1 of 1 people found this helpful
                            • 11. Re: Amplifier Simulation
                              OsFe_2822791

                              Hi Len,

                               

                              thank you so much for your response. I am really grateful. You´ve done a very good job. It will be useful for me, thanks.

                               

                              PD: Vadym answered me. I will add the software in this response but if you can not see, please let me know and I will send you by email.