Selective body bias for charge pump transfer switches
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United States of America Patent
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Dec 13, 2016
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app pub date -
Jan 6, 2016
filing date -
Sep 18, 2015
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Abstract
Techniques are presented for improving the efficiencies of multi-stage charge pumps by reducing the amount of voltage lost across the inter-stage transfer switches of the pump through use a selective body bias. The voltage level from both branches of one stage is each supplied though a corresponding diode to the bulk connection of the transfer switch after the subsequent stage in both branches. This arrangement results in each stage providing a largely uniform amount of gain, without the usual increase of voltage drop with increasing numbers of stages.
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