By Gabriele Manganaro
Have to wake up to hurry speedy at the most recent advances in excessive functionality facts converters? wish aid settling on the easiest structure in your program? With every little thing you want to learn about the most important new converter architectures, this advisor is for you. It provides uncomplicated rules, circuit and process layout ideas and linked trade-offs, taking away long mathematical proofs and delivering intuitive descriptions in advance. 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 broad comparability among architectural or circuit techniques, ease structure choice and assist you reduce layout time and engineering hazard. Trade-offs, merits and downsides of every alternative are placed into standpoint with a dialogue of destiny developments, displaying the place this box is heading, what's riding it and what crucial unanswered questions are.
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Additional info for Advanced data converters
As stated, this is a potential, and that is a critical point, because complex calibration algorithms can require quite some time as well, and, since it is often required that the device be completely calibrated before ATE testing is completed, it can, again, lead to the same cost issue as has already been mentioned in the case of factory trimming. A further distinction in the context of calibration refers to when that is performed. In particular, a data converter can be calibrated while it is performing the regular conversion operation, and the result of the conversion must not be affected by the calibration process itself.
However, such events are rare and, from an engineering standpoint, we won’t operate on the assumption that this will actually happen. 22 A refresher on the basics the harmonic distortion resulting from DNL errors [58, 59, 60]. Because of this masking effect due to noise, for converters whose input referred (thermal) noise is larger than , the DNL is not a very useful metric . The DNL and INL can be minimized by design. These errors often originate from a combination of mismatch of active and passive components as well as from circuit limitations such as finite gain of amplifiers in closed feedback circuits.
This is a huge topic that would require more than one entire book to cover properly; moreover, due to both the demand for higher-accuracy converters and the increasing challenges offered by nanometer-scale process technologies, the recourse to calibration for data converters is becoming a recurring necessity and it is thus driving a rapid expansion of this topic. Many of the advanced ADCs and DACs discussed in the following chapters will provide effective examples of smart application of new calibration techniques.