By Gabriele Manganaro
Have to wake up to hurry fast at the most up-to-date advances in excessive functionality info converters? wish support settling on the simplest structure on your program? With every thing you want to find out about the most important new converter architectures, this advisor is for you. It offers easy ideas, circuit and process layout strategies and linked trade-offs, casting off long mathematical proofs and offering intuitive descriptions prematurely. every little thing from time-to-digital converters to comparator-based/zero-crossing ADCs is roofed and every subject is brought with a brief precis of the basic fundamentals. functional examples describing genuine chips, besides huge comparability among architectural or circuit recommendations, ease structure choice and assist you lower layout time and engineering chance. Trade-offs, merits and downsides of every alternative are placed into point of view with a dialogue of destiny developments, exhibiting the place this box is heading, what's using it and what crucial unanswered questions are.
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Extra info for Advanced data converters
For example, harmonics that may fall beyond the Nyquist frequency f s /2 are aliased back within this range and therefore are accounted for. However, when dealing with narrow bands, or when using oversampled converters, even lower-order harmonics such as the second- or the third-order harmonic could have sufficiently high frequency to fall outside the observed frequency range (or not to be aliased back within the observed frequency range). In the event that these harmonics fall outside the observation range, clearly, one could be led to the erroneous conclusion that the system under observation achieves low distortion.
The gain error does not introduce nonlinearity. However, it can be an important error to account for in some applications such as, for example, in test and measurement applications and in some industrial applications. If necessary, the gain error is generally easy to compensate for by means of various circuit techniques and/or trimming or calibration. The offset error, formally, does introduce nonlinearity since the superposition principle does not hold;2 however, since it does not introduce harmonics and it too can be easily compensated for by means of various circuit techniques and/or trimming or calibration, it isn’t a difficult matter to deal with.
9 This could be a known closed-form model of the nonlinearity, a polynomial expansion, or a look-up table; there is a wealth of theory of “modeling and parameter estimation” behind this [102, 103, 104]. 3. FOMs too, partly due to their extreme simplicity, don’t often do proper justice to the performance of converters. Nevertheless, and in spite of the endless and animated debates they generate among practitioners, FOMs can be used as a tool to spot trends or to make some quick comparisons. 4. These charts open up many important questions.