METHODS AND SYSTEMS FOR USING A DIFFERENTIAL LIGHT DRIVE IN A PHYSIOLOGICAL MONITOR
First Claim
1. A system for driving a light source for a physiological monitor, the system comprising:
- a first light drive signal generator configured to generate a first light drive signal to be applied to a first input of a first light source; and
a second light drive signal generator configured to generate a second light drive signal to be applied to a second input of the first light source, wherein the first light drive signal and the second light drive signals together provide a first differential light drive signal to the first light source.
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Abstract
A physiological monitoring system may use a differential light drive to illuminate one or more light sources. A differential light drive may include applying two signals, one to each terminal of a light emitting diode or other light source, such that the illumination of the light source is controlled by the difference between the two light drive signals. In some embodiments, light emitting diodes may be turned on and off using a differential light drive without using switches and using only unipolar voltage sources. In some embodiments, light drive signals may be 180 degrees out-of-phase, and the phase shift may be used to reduce crosstalk and other electronic noise, for example by carrying the signals in a twisted pair of conductors.
14 Citations
20 Claims
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1. A system for driving a light source for a physiological monitor, the system comprising:
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a first light drive signal generator configured to generate a first light drive signal to be applied to a first input of a first light source; and a second light drive signal generator configured to generate a second light drive signal to be applied to a second input of the first light source, wherein the first light drive signal and the second light drive signals together provide a first differential light drive signal to the first light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for driving a light source for a physiological monitor, the method comprising:
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generating, using a first light drive signal generator, a first light drive signal to be applied to a first input of a first light source; and generating, using a second light drive signal generator, a second light drive signal to be applied to a second input of the first light source, wherein the first light drive signal and the second light drive signal together provide a first differential light drive signal to the first light source. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. The method of claim 21, wherein the physiological parameter is selected from the group consisting of oxygen saturation, pulse rate, respiration rate, respiration effort, blood pressure, hemoglobin concentration, and any combination thereof.
Specification