Precharge switch-capacitor circuit and method
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United States of America Patent
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May 1, 2018
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N/A
app pub date -
Sep 9, 2016
filing date -
Sep 11, 2015
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Abstract
An input sampling stage circuit includes, a precharge buffer, a precharge switch-capacitor circuit, and an input sampling capacitor. The precharge buffer is configured to buffer an input voltage. The precharge switch-capacitor circuit includes a plurality of switches, a first capacitor, and a second capacitor configured such that the first and second capacitors are connected in series during a coarse sampling time and in parallel during a fine sampling time and charge transfer time. The input sampling capacitor is configured to sample the input voltage through the precharge switch-capacitor circuit during the coarse sampling time and sample the input voltage directly during the fine sampling time.
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