High speed successive approximation analog-to-digital converter of two bits per cycle
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United States of America Patent
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May 8, 2018
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May 21, 2015
filing date -
May 19, 2015
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Abstract
A high-speed successive approximation analog-to-digital converter of two bits per cycle, includes three switches, two capacitor arrays, three comparators, an encoding circuit, a first switch array corresponding to the first capacitor array, a second switch array corresponding to the second capacitor array, a shifting register and a digital correction unit. The analog-to-digital converter, featuring doubled speed, realizes a successive approximation process without any fault when a high-bit large capacitor is unsettled. Thus no redundancy bit capacitor is required to compensate for unsettled pre-stage large capacitor. By using the encoding circuit, a thermometer code is converted into a binary code effectively, and inherent errors of comparators are reduced by the randomization of three comparators.
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