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offset and gain error

GURU MOORTHY
Expert 2425 points

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this is one image where offset error is positive.

now in the second image offset error is negative for same condition.

out of these 2 which is correct.

  • 0
    TI__Genius 10615 points

    Hi Guru,

    I am not sure if I understand how you are using these two graphs.

    The first graph depicts both offset error and gain error,  while the second graph depicts only offset error.

    Generally offset error can be either positive or negative depending on the device. Having said that, both of these graphs show the offset error in the same direction (Offset > 0V).

    Keep in mind that offset error is the overall shift of the transfer function and does not account for zero code error which is the voltage difference between the actual voltage output at code ZERO and the ideal voltage output. Zero code error is a voltage difference at a single point, rather than an overall shift of the transfer function.

    Hopefully this helped you out a bit, let me know if I should clarify any concepts. I would recommend taking a look at this blog post on the Analog Wire: DAC Essentials: Static specifications & linearity. It may make things a bit clearer.