Ultrahigh voltage charge pump apparatus implemented with low voltage technology
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United States of America Patent
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May 17, 2016
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Sep 15, 2014
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Sep 15, 2014
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Abstract
An charge pump architecture capable of generating ultra high DC voltages but implemented in low voltage CMOS technology uses a cascade of NMOS stages with the bulk terminal of the latter stages biased to a voltage just below the reverse breakdown of the parasitic bulk diode. The bias voltage is tapped from a lower voltage point within the charge pump. The upper limit of the output voltage is then increased to the maximum allowable oxide voltage plus the parasitic diode reverse bias breakdown voltage.
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