By Hendrik van der Ploeg
This publication analyses diversified A/D-converter architectures with an emphasis at the greatest possible strength potency. It additionally offers an obtainable evaluation of the state-of-the paintings in calibration recommendations for Nyquist A/D converters. The calibration suggestions awarded are acceptable to different analog-to-digital platforms, corresponding to these utilized in built-in receivers. they permit implementation with out introducing a pace or energy penalty.
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Extra resources for Calibration Techniques in Nyquist A D Converters (The International Series in Engineering and Computer Science)
19 shows the effect of coarse comparator offsets on the overall transfer of the A/D converter when subrange overlap is used. 19: No subrange transition errors when subrange overlap is used The digital encoding of the digital signals coming from the coarse and the ﬁne A/D converter needs to resolve the errors from the coarse A/D converter. 20. The encoder needs to detect whether over- or under-range has occurred and one coarse LSB is then subtracted or added to the coarse digital code accordingly.
The active region of the input of a pre-ampliﬁer, consisting of a differential pair, is limited by the limited linear region of this input transistor pair. When the linear region is not sufﬁcient, the interpolated zero-crossings deviate from the wanted position . 4: Interpolation of pre-ampliﬁer outputs (a) and additional zero- crossing generation (b) for one interpolation stage (Nint = 1) In this derivation it is assumed that the interpolation is ideal, which means that no additional power is required for a sufﬁciently large linear region.
3 Averaging Architecture Averaging [17, 18, 19, 14] is a technique which improves the overall linearity of the A/D converter by averaging the error of an individual ampliﬁer with several neighboring ampliﬁers. This is achieved by sharing the outputs of adjacent pre-ampliﬁers by inserting averaging resistors. 6 . 6a), a random pattern is shown around the ideal curve as indicated by the thin lines connecting the open dots. The output resistors of the pre-ampliﬁers are indicated as the resistors between the open dots and the black dots.