Effects of restricting most significant bits in result

Discussion in 'Homework Help' started by elmaggan, Jul 16, 2015.

  1. elmaggan

    Thread Starter New Member

    Jul 15, 2015
    5
    0
    So i have calculated the settling time for the capacitor C in an RC circuit. The RC circuit is the result of connecting an ADC with a mutiplexer. The ADC is a 12-bit type.

    In the assignment information was given in order to fulfill the equation Vc=Vin(1-e^-t/RC) in order to find the time t (t=1164.487 ns).

    Now the time is still the parameter that is to be calculated but only 6 of the most significant bits of the result should be taking into account. So i was wondering, what is the effect of just looking at the 6 most significant bits of the result? What factors changed going in to calculating the settling time of the capacitor once more?

    Thanks!
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,805
    And we are supposed to divine the circuit you are using based on this????

    How about posting a schematic?
     
  3. elmaggan

    Thread Starter New Member

    Jul 15, 2015
    5
    0
    Yes sure, ill load the image. Also Vref=3.3 V, LSB=805.664*10^-6 V and i know that 1/4 LSB is desired. Also R=Rmux+R=3kohm+7kohm and C=12pF. That is how i reached t with some algebra and put in some values above.
     
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