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Per Westermark
11/17/11 11:27
Read: 393 times
Sweden


 
#184785 - Same-same
Responding to: Zeeshan Ashraf's previous message
Zeeshan said:
This might sound stupid, but i was wondering what if multiple Sample-and-hold amplifiers are used in front of a DAC and the DAC is run at a high speed to output a voltage that is "latched" in a Sample and Hold amp ? Lets say we talk about 8x SnH amps at front of a DA ?


Erik said:
however clumsy and imprecise id possible if your device receiveing the analogs has a reasonably high input impedance use analog switches to switch between caps connected to the high impedance analog inputs.


Zeeshan said:
However, i just dont get how u justify the CAP approach ! It sounds more dumbfounded than the S&H theory.


But capacitors + analog switches are just a specific implementation of a S/H solution. It's just that you can have it all integrated in a chip, or build it with discrete components.

http://en.wikipedia.org/wiki/Sample_and_hold


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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