LED DRIVE CIRCUIT AND METHOD FOR USING SAME
First Claim
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1. An LED drive circuit for a medical device comprising:
- a first current mirror configured to supply a first current to activate a first LED of a sensor, wherein the first current mirror comprises a plurality of transistors, wherein one of the transistors of the first current mirror is coupled to a DAC output of a microcontroller.
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Abstract
In various embodiments, there is provided an LED drive circuit and a method for using the same. Specifically, the present disclosure is directed to an LED drive circuit for pulse oximeters. In an embodiment, the LED drive circuit includes a current mirror configured to provide drive current to an LED of a sensor. Additionally, the method includes providing current to first and second current mirrors, wherein the first and second current mirrors are configured to control first and second light sources.
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Citations
20 Claims
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1. An LED drive circuit for a medical device comprising:
a first current mirror configured to supply a first current to activate a first LED of a sensor, wherein the first current mirror comprises a plurality of transistors, wherein one of the transistors of the first current mirror is coupled to a DAC output of a microcontroller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A monitor for measuring a physiological parameter comprising:
a light drive circuit comprising; a first current mirror drive circuit with a first current input; a second current mirror drive circuit with a second current input, wherein the first and second current mirror drive circuits are configured to alternately supply current to at least two light sources; and wherein the first current mirror drive circuit or the second current mirror drive circuit, or both, are configured to amplify an output current provided by a microcontroller. - View Dependent Claims (14, 15, 16, 17)
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18. A method of operating a light drive circuit for a device for measuring a physiological parameter comprising:
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providing a first current to a first constant current source, the first constant current source configured to control a first light source; providing a second current to a second constant current source, the second constant current source configured to control a second light source; and turning off current to both the first and second constant current sources for a period after each instance of either the first or second constant current sources being turned on; wherein providing first and second currents comprises providing first and second output currents. - View Dependent Claims (19, 20)
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Specification