A system for measuring optical proximity based on reflection of modulated light is presented. Its novel input stage topology comprising an ac coupled TIA and a two stage dc rejection circuit based on a synthesized inductance, provides readouts with a resolution better than 13.2 ENOB. This allows the sensor system to be flexibly used also for heart rate and blood oximetry monitoring.
Sant, L., Fant, A., Stojanović, S., Fabbro, S., Ceballos, J. (2016). A 13.2 b Optical Proximity Sensor System With 130 klx Ambient Light Rejection Capable of Heart Rate and Blood Oximetry Monitoring. IEEE JOURNAL OF SOLID-STATE CIRCUITS, 51(7), 1674-1683 [10.1109/JSSC.2016.2562105].
A 13.2 b Optical Proximity Sensor System With 130 klx Ambient Light Rejection Capable of Heart Rate and Blood Oximetry Monitoring
Sant, Luca;
2016
Abstract
A system for measuring optical proximity based on reflection of modulated light is presented. Its novel input stage topology comprising an ac coupled TIA and a two stage dc rejection circuit based on a synthesized inductance, provides readouts with a resolution better than 13.2 ENOB. This allows the sensor system to be flexibly used also for heart rate and blood oximetry monitoring.
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