Integrated non-linearity (INL) and differential non-linearity (DNL) correction techniques for digital-to-analog converters (DACs)
A digital-to-analog converter, integral nonlinear technology, applied in the direction of digital-to-analog converter, analog/digital conversion calibration/test, analog/digital conversion, etc.
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[0033] For INL correction, various techniques for reducing the effect of INL can be used, resulting in different trade-offs as they involve computational requirements and on-chip storage. As described in more detail below, in one embodiment, the most efficient segment of the DAC (e.g., figure 1 Each sub-segment of the middle segment 110_1) (except the end sub-segment, which is used to eliminate the unintentional gain error caused by INL correction) determines a correction code. Various correction techniques can be used including, but not limited to, zero-order correction (essentially INL offset correction), or first-order correction (linear fit between major inflection points in the INL curve).
[0034] Particular embodiments of the present invention relate to systems, devices, and methods that use a look-up table to reduce the INL of a DAC without modifying the DAC output voltage range, while still providing a monotonic DAC. In some embodiments, the size of the lookup table...
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