Digital to Analog conversion in Multisim

Discussion in 'General Electronics Chat' started by xxxyyyba, Apr 21, 2016.

  1. xxxyyyba

    Thread Starter Member

    Aug 7, 2012
    249
    2
    Here is schematic for Analog to Digital conversion:

    [​IMG]

    Here are two Digital to Analog converters in Multisim:

    [​IMG]

    Which one should I use? I want to connect it at output of ADC to get original sine wave. How should I connect it (which pins should I use)?

    EDIT:
    I found answer, however, other problem occurs :)
    Here is schematic with 8bit DAC:

    [​IMG]

    Here is transient analysis, showing input and output sine wave:

    [​IMG]

    What are voltage spikes at output signal?
     
    Last edited: Apr 21, 2016
  2. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,233
    D/A converters can have spikes in there output when all all the bits are changing at an MSB rollover due to the fact that the interal switches can't all change instantly .
    You need a low-pass filter or sample-and-hold at the output to smooth out the glitches.
     
    xxxyyyba likes this.
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