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Zeeshan Ashraf
11/17/11 11:25
Read: 389 times
Karachi
Pakistan


 
#184784 - RE: #184782 - how else would you ...
Responding to: Erik Malund's previous message
Sample-and-Hold amplifier does 2 things :

1) Samples its input voltage level, AND
2) Holds or maintains it at its output terminal, for some time interval before which the voltage starts to drop.

So, If a D/A is feeding 8 S&H amps, then theoretically a control loop in a controller can writes each of 8x different values to the D/A while enabling each S&H to sample its inputs. This could be in a round-robin fashion.

If the loop can update all S&H amps within the time it takes 1 S&H to start loosing the voltage level, then wouldnt all S&H be holding their respective voltage levels, albeit with some, though acceptable, droops / jitters ?


List of 20 messages in thread
TopicAuthorDate
Multiple Analog Outputs.      Zeeshan Ashraf      11/17/11 08:14      
   Don't dismiss single DACs      Oliver Sedlacek      11/17/11 08:47      
   Resolution/precision      Per Westermark      11/17/11 09:03      
      RE: #184777 - Resolution/precision      Zeeshan Ashraf      11/17/11 10:49      
         But is 4k steps needed when you have play?        Per Westermark      11/17/11 11:22      
   not for commercial use      Erik Malund      11/17/11 09:57      
      RE: #184778 - not for commercial u      Zeeshan Ashraf      11/17/11 10:44      
         how else would you ...      Erik Malund      11/17/11 11:14      
            RE: #184782 - how else would you ...      Zeeshan Ashraf      11/17/11 11:25      
         Same-same      Per Westermark      11/17/11 11:27      
            RE: #184785 - Same-same      Zeeshan Ashraf      11/17/11 11:32      
               why do you think I said "high input impedance"?      Erik Malund      11/17/11 11:46      
      Similar stuff !      Zeeshan Ashraf      11/17/11 11:59      
   State the actual requirement!      Andy Neil      11/17/11 12:26      
      RE:#184789 - State the actual requirement!      Zeeshan Ashraf      11/17/11 14:16      
         Still no answer to "need"      Per Westermark      11/17/11 14:22      
         No, that is not a requirement!      Andy Neil      11/17/11 15:28      
            Very interesting how this always comes up      Justin Fontes      11/18/11 10:31      
            RE: #184792 - No, that is not a requirement!      Zeeshan Ashraf      11/19/11 16:48      
               Yes, bits matter      Per Westermark      11/19/11 17:03      

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