Reduced wire count voltage drop sense
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United States of America Patent
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Feb 24, 2004
Grant Date -
Apr 10, 2003
app pub date -
Oct 10, 2001
filing date -
Oct 10, 2001
priority date (Note) -
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Abstract
The present invention provides a reduced wire count voltage-drop sense system and method wherein the voltage drop across a load device is determinable using only one sense lead regardless of the number of load devices. In one embodiment, the voltage drop across any one of four LEDs (220A-D) in a photoplethysmographic probe when a drive current is applied therethrough via one of four input drive leads (230A-D) connected to separate LED terminals (222A-D) is determinable from a first voltage drop and a second voltage drop, for example, by subtracting the second voltage drop, or a portion thereof, from the first voltage drop. The first voltage drop is measurable across a terminal (232A-D) of the input drive lead (230A-D) connected to the LED (220A-D) across which the voltage drop is to be determined and a terminal (252) of a sense lead (250) connected to a common LED terminal (224). The second voltage drop is measurable across the sense lead terminal (252) and a terminal (242) of a common drive lead (240) connected to the common LED terminal (224).
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