Voltage boost circuit and low supply voltage sampling switch circuit using same
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United States of America Patent
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-
Apr 20, 2004
Grant Date -
Jan 30, 2003
app pub date -
May 28, 2002
filing date -
Jul 24, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A voltage boost circuit includes a boost capacitor; a charge circuit for charging in the charging mode the boost capacitor to a supply voltage, the charging circuit including a charging MOS switch interconnected between the supply voltage and one terminal of the boost capacitor and a back gate isolation circuit connected to the back gate of the charging MOS switch and including a first switch for connecting the back gate to the supply voltage for reverse biasing the back gate in the charging mode and the second switch for connecting the back gate to the one terminal of the boost capacitor for reverse biasing the back gate in the boost mode to prevent charge loss from the boost capacitor; and a boost bias voltage and a boost switch for connecting the second terminal of the boost capacitor to the boost bias voltage in the boost mode.
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