Comparator circuit
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United States of America Patent
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Apr 16, 2002
Issued Date -
N/A
app pub date -
Jan 10, 2001
filing date -
Dec 21, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A charge pump system includes a charge pumping circuit for outputting a high voltage V.sub.PP at a node. An oscillator circuit, coupled to the charge pumping circuit, drives the charge pumping circuit with at least one clock signal. A current source generates a pulldown current. A voltage divider circuit is coupled between the node and the current source. The voltage divider circuit cooperates with the current source to form a feedback loop for controlling the oscillator circuit to run at variable, optimum frequency for controlling the rate-of-rise and the amplitude of the high voltage V.sub.PP while minimizing power-supply current drain.
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