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.
16 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:
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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