By Gabriele Manganaro
Have to wake up to hurry speedy at the most up-to-date advances in excessive functionality facts converters? wish aid opting for the easiest structure in your program? With every thing you must find out about the main new converter architectures, this advisor is for you. It offers uncomplicated rules, circuit and approach layout thoughts and linked trade-offs, casting off long mathematical proofs and offering 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 fundamental fundamentals. sensible examples describing real chips, in addition to wide comparability among architectural or circuit strategies, ease structure choice and assist you minimize layout time and engineering possibility. Trade-offs, benefits and downsides of every choice are placed into point of view with a dialogue of destiny traits, displaying the place this box is heading, what's riding it and what an important unanswered questions are.
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Additional info for Advanced data converters
4) and its reciprocal THD + N = 1/SNDR, which is more commonly encountered in digital audio applications . ) and Pn is the power of the corresponding harmonic. 6) where Phmax is the power of the largest undesired signal (frequency-related or unrelated to the useful signal). Related to the SNR is also the dynamic range (DR), which is the power ratio between the largest and smallest detectable signals (the smallest being essentially the noise, which can either be the quantization noise or the actual device noise, depending on the specific case).
For example, how can we push the speed–resolution boundary further? g. a pipelineADC or a current-steeringDAC) that take advantage of each architecture’s strengths and compensate for the respective limitations? Is process technology driving the adoption and advancement of some architectures as opposed to others or, even, leading to the introduction of new architectures? 5 briefly summarized the key concepts behind trimming and calibration. 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.
To address the theoretical limitation cited above, for thermal-noise-limited ADCs (shot-noise-limited ADCs show the same type of trend), modified FOMs with a squared accuracy term have been proposed by various authors [29, 83]. 11) where the accuracy term SNTR, the signal-to-thermal-noise ratio, now appears raised to the power of 2. Another variant, increasing in value for better-performing designs, 6 With negligible distortion and quantization noise. 12) Surveys of ADCs’ performance have been published over the years [28, 80].