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PDF folding for stochastic flash ADCs

TitlePDF folding for stochastic flash ADCs
Publication TypeConference Paper
Year of Publication2010
AuthorsWeaver, S. T., B. P. Hershberg, and U. Moon
Conference Name17th IEEE International Conference on Electronics, Circuits and Systems - (ICECS 2010)
Pagination770 - 773
Date Published12/2010
Conference LocationAthens, Greece
ISBN Number978-1-4244-8155-2

A circuit is presented that halves the number of comparators required for a two-group stochastic flash ADC. In a two-group stochastic flash ADC, two Gaussian PDFs are shifted left and right by applying a global offset reference to the two groups of comparators. This creates a virtual uniform distribution of comparator offset between the two global offsets. Over half of the comparators fall outside of the virtual uniform distribution and are not used. The proposed circuit inverts the polarity of each comparator offset until it is within the useful range, creating a virtual uniform distribution of comparator offsets with few comparators wasted.