Daniel Lisogurski,Christopher Meehan,William Kit Dean,Andy S. Lin
申请号：
US13942391
公开号：
US20150018649A1
申请日:
2013.07.15
申请国别(地区):
US
年份:
2015
代理人:
摘要：
A physiological monitoring system may use a differential light drive to illuminate one or more light sources. A differential light drive may include applying two signals, one to each terminal of a light emitting diode or other light source, such that the illumination of the light source is controlled by the difference between the two light drive signals. In some embodiments, light emitting diodes may be turned on and off using a differential light drive without using switches and using only unipolar voltage sources. In some embodiments, light drive signals may be 180 degrees out-of-phase, and the phase shift may be used to reduce crosstalk and other electronic noise, for example by carrying the signals in a twisted pair of conductors.
