Power detection circuit for non-contact IC card or RFID tag
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United States of America Patent
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Oct 21, 2008
Grant Date -
Feb 1, 2007
app pub date -
Feb 23, 2006
filing date -
Jul 28, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A power detection circuit has a first comparator block, a charge controller block, and a second comparator block. The first comparator block compares a supply voltage with a first threshold value, and the charge controller block controls the charging of a first capacitor according to an output signal of the first comparator block. The second comparator block compares the charge in the first capacitor with a second threshold value so as to produce a power detection signal, and wherein a second capacitor is interposed between the charge controller block and the first capacitor.
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