MULTI-STREAM SENSOR FRONT ENDS FOR NONINVASIVE MEASUREMENT OF BLOOD CONSTITUENTS
First Claim
1. A front-end interface for a noninvasive, physiological sensor, said front-end interface comprising:
- a set of inputs configured to receive signals from a plurality of detectors in the sensor;
a set of switched capacitor circuits configured to convert the signals from the plurality of detectors into a digital output signal having a stream for each of the plurality of detectors; and
an output configured to provide the digital output signal.
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Abstract
The present disclosure relates to an interface for a noninvasive glucose sensor that comprises a front-end adapted to receive an input signals from optical detectors and provide corresponding digital signals. In one embodiment, the front-end comprises switched capacitor circuits that are capable of handling multiple streams signals from the optical detectors. In another embodiment, the front-end comprises transimpedance amplifiers that are capable of handling multiple streams of input signals. In this embodiment, the transimpedance amplifier may be configured based on its own characteristics, such as its impedance, the impedance of the photodiodes to which it is coupled, and the number of photodiodes to which it is coupled.
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Citations
18 Claims
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1. A front-end interface for a noninvasive, physiological sensor, said front-end interface comprising:
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a set of inputs configured to receive signals from a plurality of detectors in the sensor; a set of switched capacitor circuits configured to convert the signals from the plurality of detectors into a digital output signal having a stream for each of the plurality of detectors; and an output configured to provide the digital output signal. - View Dependent Claims (2, 3)
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4. A conversion processor for a physiological, noninvasive sensor, said board comprising:
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a multi-stream input configured to receive signals from a plurality of detectors in the sensor, wherein the signals are responsive to optical radiation from a tissue site; a modulator that converts the multi-stream input into a digital bit-stream; and a signal processor that produces an output signal from the digital bit-stream. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A front-end interface for a noninvasive, physiological sensor, said front-end interface comprising:
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a set of inputs configured to receive signals from a plurality of detectors in the sensor; a set of respective transimpedance amplifiers for each detector configured to convert the signals from the plurality of detectors into an output signal having a stream for each of the plurality of detectors; and an output configured to provide the output signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification