Pulse oximeter having a low power led drive
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United States of America Patent
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-
May 1, 2001
Grant Date -
N/A
app pub date -
May 26, 1999
filing date -
May 26, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A photometer (10) includes a light source (12) operable to direct light toward a sample (14), a detection circuit (16) operable to detect the light after it has passed through the sample, and a drive circuit (18) for powering the light source. The drive circuit includes an input (20) for coupling with a source of power and energy storage circuitry (22) coupled with the input. The energy storage circuitry is operable to store energy from the source of power when switched to a charging state and to deliver current to the light source in a ramped manner when switched to a discharge state so that the current peaks at a selected time. The drive circuit delivers a controlled amount of current to the light source that peaks only after the detection circuit has settled so that power is not wasted at the startup of the oximeter.
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