Circuit arrangement and method for generating a time-limited signal
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United States of America Patent
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Oct 19, 2004
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N/A
app pub date -
Sep 12, 2002
filing date -
Sep 24, 2001
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Abstract
A circuit includes a second switching unit, a first switching unit that is connected to and selectively actuates the second switching unit, and a capacitive voltage divider including first, second and third capacitances connected in series. The first and second switching units are connected respectively to first and second junctions between the first and second and the second and third capacitances respectively. An associated method involves applying a supply voltage to the voltage divider so as to charge the first and second junctions, discharging the first junction through the first switching unit, which, dependent on the voltage of the first junction, selectively actuates the second switching unit to supply an additional charging current to the second junction. A time-limited signal such as a power-on reset signal is tapped from the first or second switching unit or from the second junction. Thereafter, the circuit draws no further current.
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