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???
12/25/06 10:18
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 		 #130089 - Thats the problem
Responding to: ???'s previous message
Ap Charles said:

Steve that what I guessed the very first and OP is worried about loop stability only 100Khz with such slew limited opamp ??, what ever you do you dont even get proper waveforms ?


My sense here is that, unless the op-amp can faithfully reproduce the error signals demanded of it, you aren´t going to get the performance you are looking for.

Increase the error amp performance - hell, even a 741 is faster, albeit, it has other issues, but it will help determine the source of the problem.

Steve



List of 30 messages in thread
TopicAuthorDate
How should I limit bandwith of amplifier?            01/01/70 00:00      
   That's how an OPamp works            01/01/70 00:00      
      you mean I have to choose a correct power amp?            01/01/70 00:00      
         Pure C ?            01/01/70 00:00      
            is there any other way?            01/01/70 00:00      
               putting C or RC across error            01/01/70 00:00      
                  More opamps can exacerbate the problem            01/01/70 00:00      
         The idea was..            01/01/70 00:00      
            you are very corect but...            01/01/70 00:00      
               ???            01/01/70 00:00      
                  sorry, I had not read your first post carefully            01/01/70 00:00      
                     the laboratory that has ordered            01/01/70 00:00      
                        ???            01/01/70 00:00      
                           This is the first ....            01/01/70 00:00      
                     OP 07            01/01/70 00:00      
                        right            01/01/70 00:00      
                        slewrate is very low            01/01/70 00:00      
                           Thats the problem            01/01/70 00:00      
                              waveform shape is not the immediate concern            01/01/70 00:00      
                     How?            01/01/70 00:00      
                        Re: How            01/01/70 00:00      
                           Why not measuring voltage drop across load?            01/01/70 00:00      
                              @100KHz?            01/01/70 00:00      
                                 Yes !            01/01/70 00:00      
                                 Yes, of course!            01/01/70 00:00      
                                    Re:Yes            01/01/70 00:00      
                                       Much much easier!            01/01/70 00:00      
   Even more problems...            01/01/70 00:00      
      Spec.            01/01/70 00:00      
      Phase, capacitive load            01/01/70 00:00      

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