Low-noise optical current source
First Claim
1. A current source for producing an output current that simulates a current generated by an optical patient sensor, the optical patient sensor including a sensor light source having a first characteristic profile and a sensor photodetector having a second characteristic profile, the current source comprising:
- a light source configured to emit light in response to a drive signal, the light source having a characteristic profile that is similar to the first characteristic profile as to indicate interchangeability between the light source and the sensor light source;
a first photodetector configured to produce the output current in response to receiving light from the light source, the first photodetector having a characteristic profile similar to the second characteristic profile as to indicate interchangeability between the sensor photodetector and the first photodetector; and
a control unit configured to;
receive a signal indicative of light emitted by the light source based on an output of a second photodetector;
provide the drive signal to the light source based at least in part on the received signal indicative of light emitted by the light source and a waveform control signal.
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Accused Products
Abstract
Systems, methods for manufacturing, and devices for producing an output current that simulates a current generated by an optical patient sensor are provided. An optical patient sensor includes a sensor light source having a first characteristic profile and a sensor photodetector having a second characteristic profile. The current source includes a light source having a characteristic profile similar to the first characteristic profile and indicative of interchangeability between the light source and the sensor light source, and a first photodetector configured to produce an output current in response to receiving light from the light source, the first photodetector having a characteristic profile similar to the second characteristic profile and indicative of interchangeability between the sensor photodetector and the first photodetector.
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Citations
22 Claims
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1. A current source for producing an output current that simulates a current generated by an optical patient sensor, the optical patient sensor including a sensor light source having a first characteristic profile and a sensor photodetector having a second characteristic profile, the current source comprising:
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a light source configured to emit light in response to a drive signal, the light source having a characteristic profile that is similar to the first characteristic profile as to indicate interchangeability between the light source and the sensor light source; a first photodetector configured to produce the output current in response to receiving light from the light source, the first photodetector having a characteristic profile similar to the second characteristic profile as to indicate interchangeability between the sensor photodetector and the first photodetector; and a control unit configured to; receive a signal indicative of light emitted by the light source based on an output of a second photodetector; provide the drive signal to the light source based at least in part on the received signal indicative of light emitted by the light source and a waveform control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of manufacturing a current source for producing an output current that simulates a current generated by an optical patient sensor, the optical patient sensor including a sensor light source having a first characteristic profile and a sensor photodetector having a second characteristic profile, the method comprising:
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selecting a light source having a characteristic profile similar to the first characteristic profile as to indicate interchangeability between the light source and the sensor light source; selecting a photodetector having a characteristic profile similar to the second characteristic profile as to indicate interchangeability between the photodetector and the sensor photodetector, the photodetector configured to produce the output current in response to receiving light from the light source; coupling the light source and photodetector to a control unit, the control unit, comprising a control photodiode, configured to provide a drive signal to the light source; and coupling a connector to the photodetector, whereby the output current is provided to the connector. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification