Stochastic ADC with random U-quadratic distributed reference voltages to uniformly distribute comparators trip point
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Stochastic ADC with uniformly distributed comparators trip point is presented. A basic comparator will have an offset that follows Gaussian distribution. When the comparator offset is used as the trip points for stochastic ADC, only 68 % of the comparators will be in the useful input range. By adding voltages that follow random U-quadratic distribution to the comparators’ reference inputs, their trip points will shape into uniform distribution, and 80 % of them will lie within the useful input range. That will not only increase the resolution of stochastic ADC but also its input dynamic range.
KeywordsU-quadratic distribution Uniform distribution Gaussian distribution Comparator offset voltage
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