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???
12/26/06 00:11
Modified:
  12/26/06 00:15
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 		 #130111 - Yes, of course!
Responding to: ???'s previous message
Alireza said:
Are you sure your way is easier???? At 100KHz??? Are you suggesting to read voltage drop or current waveform at 100KHz synchronously across a series resistor and the load , then calculate Z=V/I then compare phase of excitation voltage waveform with current waveform and extract phase information? Digitally?

Yes! Amplitudes can easily be measured by the help of OPamp based analog precision rectifiers and phase information can be determined by measuring the time delay between the zero crossings of current waveform and voltage waveform.

But I would compare the load voltage waveform (not the excitation voltage waveform) with the shunt current waveform to determine the phase information.

Excitation voltage waveform and its phase is irrelevant. Only the amplitudes of load voltage waveform and shunt current waveform, and their relative phase to each other is what counts.

Kai

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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