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???
03/06/11 15:56
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 		 #181449 - Information content..
Responding to: ???'s previous message
Many Thanks to Per Westermark and Richard Erlacher for the solutions to my problem.

Most of the information on the signal is contained in it's root mean square value, therefore, I was wondering if I could use a RMS to DC converter chip (such as the AD637:http://www.analog.com/en/other-products/rms-to-dc-converters/ad637/products/product.html )to convert my oscillating signal to a DC value of it's RMS. This would save me the extra software effort of converting the input signal into it's RMS value and then processing it even saving a couple of ADC and timer interrupts, which I may use for other purposes.

Will this option really work for me?

Or would it be better for me to simply use the summing amplifier technique?


List of 28 messages in thread
TopicAuthorDate
Adding a DC biac to a bipolar signal?            01/01/70 00:00      
   summing            01/01/70 00:00      
      Resitor bias            01/01/70 00:00      
         Yes, mentioned but maybe missed            01/01/70 00:00      
   What about the character of the signal?            01/01/70 00:00      
      Information content..            01/01/70 00:00      
         Hardly....            01/01/70 00:00      
            So the only option would be software RMS?            01/01/70 00:00      
               100Hz or 100 beats per minute?            01/01/70 00:00      
                  100Hz.            01/01/70 00:00      
                     50-150Hz is in the range of AD637!            01/01/70 00:00      
                        That's great! (but some other concerns...)            01/01/70 00:00      
                           Can you show us a typical signal?            01/01/70 00:00      
                              A Typical EMG Signal            01/01/70 00:00      
                                 Probably tough for rms chi            01/01/70 00:00      
                                    I'm working with a dsPIC            01/01/70 00:00      
                                       Shouldn't be too expensive            01/01/70 00:00      
                                 Give the AD637 a try...            01/01/70 00:00      
                                    Look at LTC1966            01/01/70 00:00      
                                       Interesting...            01/01/70 00:00      
                                          Just received a fresh new batch of AD637s            01/01/70 00:00      
               Negative supply voltage available?            01/01/70 00:00      
   Does your system have a driven electrode?            01/01/70 00:00      
   better be careful            01/01/70 00:00      
      Regrowth            01/01/70 00:00      
         are you suggesting that humans are expendable?            01/01/70 00:00      
            All precautions taken.            01/01/70 00:00      
            Obviously            01/01/70 00:00      

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