By Gabriele Manganaro
Have to wake up to hurry quick at the most modern advances in excessive functionality facts converters? wish support picking the simplest structure on your program? With every thing you must learn about the foremost new converter architectures, this advisor is for you. It offers simple ideas, circuit and approach layout suggestions and linked trade-offs, taking away 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 quick precis of the fundamental fundamentals. useful examples describing real chips, besides broad comparability among architectural or circuit thoughts, ease structure choice and assist you minimize layout time and engineering danger. Trade-offs, merits and drawbacks of every alternative are placed into viewpoint with a dialogue of destiny developments, displaying the place this box is heading, what's riding it and what an important unanswered questions are.
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Additional resources for Advanced data converters
The last distinction we will consider in this section refers to analog and digital calibration. As the adjective suggests, in analog calibration the corrective action happens 8 While some of the effects of slowly varying supply fluctuations might be reduced, supply noise cannot be corrected by calibration because it has a significant power content at very high frequency. 40 A refresher on the basics in the analog domain. So, for example, if, due to process-supply voltage–temperature (PVT) variation, a certain current drops in a section of an amplifier, hence leading to a reduction in bandwidth, then a compensation current may be injected to counter this variation and restore the desired bandwidth value.
23 The metrics discussed in the following vary in value depending on the amplitude and on the frequency of the signals involved . So quoting a certain metric requires describing the conditions under which it is provided. In the case of ADCs, when these conditions aren’t explicitly stated, it is often implied that the input signal is at full scale amplitude and at the Nyquist frequency ( f s /2). In the case of DACs, especially the current-steering DACs discussed in Chapter 4, on the other hand, most dynamic metrics vary dramatically in value depending upon the output signal power (Psig ), frequency ( f out ), and output rate ( f s ), so specifying the conditions under which a metric is quoted is absolutely mandatory.
2). Hence, since for DACs we measure the step sizes on the vertical axis, when there is a non-monotonicity problem then a DNL < −1 is actually possible. Furthermore, again both for ADCs and for DACs, step-size errors also lead the transfer characteristic to move away from the ideal straight line. The net deviation of the actual characteristic from such an ideal straight line is quantified by the INL. As the nomenclature of these two errors suggests, the DNL at each step bears no memory of such deviation errors that have occurred at other steps and it is a localized error.
Advanced data converters by Gabriele Manganaro