Substrate-sensing voltage sensor for voltage comparator with voltage-to-current converters for both reference and input voltages
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United States of America Patent
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Jan 24, 2006
Issued Date -
N/A
app pub date -
May 23, 2005
filing date -
Oct 6, 2003
priority date (Note) -
Expired
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Abstract
A stable voltage that is independent of supply voltage is applied to a pair of current sources. A first current source generates a first current that passes through a first resistor, setting a compare-input voltage. A source-input voltage is applied to the first current source to vary the first current and the compare-input voltage. A second current source generates a stable current that passes through a second resistor, setting a reference voltage. The compare-input voltage and the reference voltage are applied to inputs of a comparator that generates an output voltage that indicates when the source-input voltage causes the compare-input voltage to rise past the reference voltage. The first and second currents track each other over temperature and process variations and are independent of supply voltage. A more accurate comparison of the source-input voltage is thus made.
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