Patent ID: 8688183

Claim:
A non-invasive physiological sensor configured to output one or more output signals indicative of one or more physiological conditions of a patient being monitored, the sensor comprising: a plurality of light emitting sources configured for transmitting optical radiation to a measurement site; one or more detectors configured to output to a patient monitor said one or more output signals responsive to said optical radiation detected after attenuation by body tissue of said patient at said measurement site, said one or more output signals indicative of said one or more physiological conditions of said patient; a plurality of switches configured for selectively connecting one or more of the light emitting sources to one or more drive signals; and a decoder circuit comprising N input terminals and up to 2 N output terminals, said decoder circuit configured to control the plurality of switches via the up to 2 N output terminals and receive N input signals via the N input terminals, wherein N is greater than 2, said decoder circuit configured to implement an addressing system capable of selectively individually addressing 2 N unique outputs based on the N input signals, said decoder circuit configured to activate an output terminal of the up to 2 N output terminals based on the N input signals to cause one or more of said plurality of switches to connect at least one of said light emitting sources to transmit said optical radiation to said measurement site.