公开(公告)号：US20170245803A1

公开(公告)日：2017-08-31

申请号：US15298764

申请日：2016-10-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Hussam AHMED ,  Jagannathan VENKATARAMAN ,  Sandeep Kesrimal OSWAL ,  Antoine Lourdes Praveen AROUL ,  Hari Babu TIPPANA ,  Anand Hariraj UDUPA

IPC: A61B5/00 ,  A61B5/0205 ,  A61B5/1455

CPC classification number: A61B5/7225 ,  A61B5/02416 ,  A61B5/681 ,  A61B5/7203 ,  A61B2560/0247

Abstract: A bio-sensing device (and method) calibrates a time period used to make bio-physical measurements. The device initiates a light source sense phase followed by a first ambient sense phase and a second ambient sense phase. In the light source sense phase, the device is configured to receive a digital value indicative of current through a photodetector while the light source circuit is enabled and in each of the first and second ambient sense phases, the device is configured to receive digital values while the light source circuit is disabled. The device iteratively varies the time period between the phases until the digital value received during the first ambient sense phase is within a threshold of the digital value received during the second ambient sense phase. It then applies the same time separation between the light source sense phase and the ambient phase thereby equalizing the magnitude of the ambient light in the two phases.

公开(公告)号：US20170299429A1

公开(公告)日：2017-10-19

申请号：US15491729

申请日：2017-04-19

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Hussam AHMED ,  Jagannathan VENKATARAMAN ,  Sandeep Kesrimal OSWAL ,  Hari Babu TIPPANA ,  Anand Hariraj UDUPA

IPC: G01J1/44 ,  H01L31/107

CPC classification number: G01J1/44 ,  G01J2001/444 ,  G01J2001/446 ,  H01L31/02019 ,  H01L31/107

Abstract: At least some embodiments are directed to a light detection system comprising a photodiode, a transimpedance amplifier (TIA) having a differential output and a differential input coupled across the photodiode, a first bias current source coupled to an anode of the photodiode, and a second bias current source coupled to a cathode of the photodiode. The system also comprises a dynamic control logic coupled to the first and second bias current sources and configured to vary bias currents provided by the first and second bias current sources based on the differential output such that the photodiode is reverse-biased.