By Gabriele Manganaro
Have to wake up to hurry quick at the most up-to-date advances in excessive functionality info converters? wish support settling on the easiest structure to your software? With every thing you must learn about the major new converter architectures, this consultant is for you. It provides uncomplicated ideas, circuit and approach layout recommendations and linked trade-offs, eliminating long mathematical proofs and delivering intuitive descriptions in advance. every 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 basic fundamentals. sensible examples describing genuine chips, besides large comparability among architectural or circuit recommendations, ease structure choice and assist you minimize layout time and engineering danger. Trade-offs, benefits and downsides of every choice are placed into standpoint 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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Once again, on going from the SAR to the pipeline, the degree of feedback in the system has diminished, and the individual complexity of some of the building blocks has also diminished (for example the multiplicative DAC of the pipeline need only synthesize a signal of a few bits, whereas the DAC in the SAR ADC needs to account for all of the desired bits at once), hence allowing the design of higher-frequency circuits. Similar considerations can be made as we move toward various other algorithmic ADCs such as the sub-ranging ADCs, which operate under the principle of first identifying the coarse range within which the input signal lies (again, sensing) followed by a finer quantization within that range.
Emphasis is instead placed on the transfer of signal power to the load RL . 25 in front of the power provided by the supply Psupply is used in order to allow the theoretical maximum of this ratio to be 100%. Before concluding this discussion we should briefly mention, without digressing too much, something that concerns the computation of FOMs. Specifically, when comparing the FOM values reported in papers and technical reports the reader should be warned about the consistency (or lack thereof) in the computation of such values.
Also, oversampling decreases and gives way to Nyquist-rate converters. For instance, in the case of ADCs, a modulator provides a high level of resolution by exploiting both noise-shaping and oversampling . Noise-shaping is based on feedback and allows trading off of speed for dynamic range, while oversampling adds to the effect of noise-shaping by exploiting time-averaging. Because of the relatively lower frequency of the processed signals the relative complexity of some of the circuit blocks can be increased to better fit the need to handle the more linear signals, especially in the sections that are closer to the input and the summing node.