Circuit for sensing voltages beyond the supply voltage of the sensing circuit
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United States of America Patent
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Dec 26, 1989
Grant Date -
N/A
app pub date -
Jun 17, 1988
filing date -
Jun 17, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A voltage sensing circuit wherein voltages that appear at first and second sensing nodes are converted into first and second currents which are proportional to their respective voltages. A comparing circuit compares the first current to the second current and generates a difference current proportional to the difference between the magnitudes of the two currents. A rectifier circuit rectifies the difference current, and the difference current is added to a reference current. The combined current is applied to the first input terminal of a comparator. The second input terminal of the comparator is coupled to a reference voltage, and the comparator indicates when the voltage created from the combined currents exceeds the reference voltage.
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