Ferrite stabilized LED drive
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United States of America Patent
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Mar 16, 2004
Grant Date -
Feb 12, 2004
app pub date -
Aug 8, 2002
filing date -
Aug 8, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
An oximeter diode-driving device has a diode, a transistor operative to controllably connect current to the diode, a current sensing resistor that senses at least part of the current, a feedback amplifier operative to control the connecting of current by the transistor according to the current sensed by the current sensing resistor, and an inductor disposed in series with the current sensing resistor. A method of driving a current through the diode of an oximeter includes driving a current through the diode by connecting the current to the diode, controlling the connecting using a feedback type amplifier, the feedback type amplifier having a current source that uses a current-limiting resistor, and adding phase lead to a current passing through the current-limiting resistor.
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