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???
03/09/07 18:51
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 		 #134656 - Current to voltage converter
Responding to: ???'s previous message
The opamp will try to position the output so that the '-'ve terminal is also at ground.

The input current flows into a virtual ground. Because it is virtual, rather than actual ground, the current continues to flow into the feed back resistor.

This produces a voltage output = -Iin * Rfb.

As long as Rfb is large enough, the output will not go into saturation. If it does, then increase Rfb.

List of 72 messages in thread
TopicAuthorDate
Understanding OpAmp Circuits.            01/01/70 00:00      
   start with the basics ...            01/01/70 00:00      
   Historical aspect            01/01/70 00:00      
   Current directions            01/01/70 00:00      
      Maybe that's his confusion.            01/01/70 00:00      
         picky, picky,            01/01/70 00:00      
            Conventional Current Flow            01/01/70 00:00      
               But WHAT is flowing?            01/01/70 00:00      
                  Please elaborate.            01/01/70 00:00      
                     The >cause< is flowing...            01/01/70 00:00      
                        A suggestion.            01/01/70 00:00      
                           What do you think?            01/01/70 00:00      
                              capacitors            01/01/70 00:00      
               I see            01/01/70 00:00      
                  Its much clear now.            01/01/70 00:00      
                     Some answers...            01/01/70 00:00      
                        reply to Answers...            01/01/70 00:00      
                           Figure 9            01/01/70 00:00      
                              It helped me finding out the answers...            01/01/70 00:00      
                                 It's there...            01/01/70 00:00      
                                    Just liked to make it clear..            01/01/70 00:00      
                                       How I would design it            01/01/70 00:00      
                                          if my load is resistive ...            01/01/70 00:00      
                                             Datasheet is a bit incomplete            01/01/70 00:00      
                                                clear till now...            01/01/70 00:00      
                                                if input is current? then output??            01/01/70 00:00      
                                                   Current to voltage converter            01/01/70 00:00      
                                                      Hhm...            01/01/70 00:00      
                                                         I stand corrected            01/01/70 00:00      
                                                   Mechanism of negative feed back            01/01/70 00:00      
                                                      Thank You!            01/01/70 00:00      
                                                         A bit more details are needed            01/01/70 00:00      
                                                            Not for Application. Just learning.            01/01/70 00:00      
                                                               Answers            01/01/70 00:00      
                                                                  gain calculation??            01/01/70 00:00      
                                                                     Compensation Techniques...            01/01/70 00:00      
                                                                        Answers III            01/01/70 00:00      
                                                                           ...            01/01/70 00:00      
                                                                           Offset nulling in low cost OpAmps..            01/01/70 00:00      
                                                                              nulling an LM358?            01/01/70 00:00      
                                                                                 Opamps with Offset null pins?            01/01/70 00:00      
                                                                                    CMRR            01/01/70 00:00      
                                                                                       Let me consider an example..            01/01/70 00:00      
                                                                                          link            01/01/70 00:00      
                                                                                             Thank you.            01/01/70 00:00      
                                                                                       start with the definition and go from there            01/01/70 00:00      
                                                                                          whether offset can be calculated using a formula.            01/01/70 00:00      
                                                                                             Calculation of Offset due to common mode voltage            01/01/70 00:00      
                                                                                                Exactly !            01/01/70 00:00      
                                                                                                   But to be true i got help from a person and...            01/01/70 00:00      
                                                                     Answers II            01/01/70 00:00      
                                                                        corrected circuit of Instrumentation Amplifier            01/01/70 00:00      
                                                                           Gain is still 19!            01/01/70 00:00      
                                                                              regarding 2K & CMRR            01/01/70 00:00      
                                                                                 Sources and Solutions            01/01/70 00:00      
                                                                                 The idea of having a common ground...            01/01/70 00:00      
                                                                  VREF            01/01/70 00:00      
   It is quite simple...            01/01/70 00:00      
   op-amp golden rules            01/01/70 00:00      
      First things first:            01/01/70 00:00      
         Always??            01/01/70 00:00      
      an addition            01/01/70 00:00      
         That's not really op-amp specific.            01/01/70 00:00      
            true, the interesting fact here is            01/01/70 00:00      
         Hardly...            01/01/70 00:00      
            I've done it            01/01/70 00:00      
               Do you remember which one?            01/01/70 00:00      
                  not really            01/01/70 00:00      
                     Although most OPamp can withstand shorts...            01/01/70 00:00      
   Op-Amp Simulator            01/01/70 00:00      
      cant run 16 bit windows program :(            01/01/70 00:00      
         Try LT Spice            01/01/70 00:00      

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