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公开(公告)号：US20150293045A1
公开(公告)日：2015-10-15
申请号：US14683338
申请日：2015-04-10
Applicant: Texas Instruments Incorporated
IPC: G01N27/04
CPC classification number: A61B5/6898 , A61B5/053 , A61B5/0535 , A61B5/0537 , A61B5/7221 , A61B2560/0468
Abstract: The disclosure provides a circuit for impedance measurement. The circuit includes an excitation source coupled between a first set of input switches. An impedance network is coupled between the first set of input switches and a first set of output switches. The impedance network includes a body impedance and a plurality of electrode impedances. A sense circuit is coupled to the first set of output switches. The sense circuit measures the body impedance and at least one electrode impedance of the plurality of electrode impedances.
Abstract translation: 本公开提供了用于阻抗测量的电路。 电路包括耦合在第一组输入开关之间的激励源。 阻抗网络耦合在第一组输入开关和第一组输出开关之间。 阻抗网络包括身体阻抗和多个电极阻抗。 感测电路耦合到第一组输出开关。 感测电路测量身体阻抗和多个电极阻抗中的至少一个电极阻抗。
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公开(公告)号：US10739433B2
公开(公告)日：2020-08-11
申请号：US15465484
申请日：2017-03-21
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Anand Hariraj Udupa , Hussam Ahmed , Jagannathan Venkataraman , Sandeep Kesrimal Oswal , Prabin Krishna Yadav , Anand Reghunathan , Kiran Rajmohan
Abstract: A system may comprise: an excitation current source; a first electrode coupled to the excitation current source; and a second electrode coupled to the excitation current source. The first and second electrodes may be configured to pass an excitation current from the excitation current source through a human body. First and second calibration resistors may be coupled to and positioned between the excitation current source and the first electrode. Third and fourth calibration resistors may be coupled to and positioned between the excitation current source and the second electrode. The system may also comprise a sensor configured to measure voltages across each of the first, second, third, and fourth calibration resistors.
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Patent Agency Ranking
公开(公告)号：US20180214084A1
公开(公告)日：2018-08-02
申请号：US15936029
申请日：2018-03-26
Applicant: Texas Instruments Incorporated
CPC classification number: A61B5/6898 , A61B5/053 , A61B5/0535 , A61B5/0537 , A61B5/7221 , A61B2560/0468
Abstract: The disclosure provides a circuit for impedance measurement. The circuit includes an excitation source coupled between a first set of input switches. An impedance network is coupled between the first set of input switches and a first set of output switches. The impedance network includes a body impedance and a plurality of electrode impedances. A sense circuit is coupled to the first set of output switches. The sense circuit measures the body impedance and at least one electrode impedance of the plurality of electrode impedances.
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公开(公告)号：US10362994B2
公开(公告)日：2019-07-30
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: A61B5/1455 , A61B5/00 , A61B5/0205 , A61B5/024
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.
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公开(公告)号：US10145736B2
公开(公告)日：2018-12-04
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 , H01L31/101 , 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.
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公开(公告)号：US10111624B2
公开(公告)日：2018-10-30
申请号：US15936029
申请日：2018-03-26
Applicant: Texas Instruments Incorporated
Abstract: The disclosure provides a circuit for impedance measurement. The circuit includes an excitation source coupled between a first set of input switches. An impedance network is coupled between the first set of input switches and a first set of output switches. The impedance network includes a body impedance and a plurality of electrode impedances. A sense circuit is coupled to the first set of output switches. The sense circuit measures the body impedance and at least one electrode impedance of the plurality of electrode impedances.
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公开(公告)号：US20150305648A1
公开(公告)日：2015-10-29
申请号：US14694500
申请日：2015-04-23
Applicant: Texas Instruments Incorporated
Abstract: The disclosure provides a circuit for impedance measurement. The circuit includes an excitation source that generates an excitation signal. A switched resistor network is coupled to the excitation source, and generates an output signal in response to the excitation signal. A sense circuit is coupled to the switched resistor network, and generates a sense signal in response to the output signal. A comparator is coupled to the sense circuit, and generates a clock signal in response to the sense signal. A mixer is coupled to the sense circuit, and multiplies the sense signal and the clock signal to generate a rectified signal. A low pass filter is coupled to the mixer and filters the rectified signal to generate an averaged signal. A processor is coupled to the low pass filter and measures a body impedance from the averaged signal.
Abstract translation: 本公开提供了一种用于阻抗测量的电路。 该电路包括产生激励信号的激励源。 开关电阻网络耦合到激励源，并且响应于激励信号产生输出信号。 感测电路耦合到开关电阻网络，并且响应于输出信号产生感测信号。 比较器耦合到感测电路，并响应于感测信号产生时钟信号。 混频器耦合到感测电路，并且将感测信号和时钟信号相乘以产生整流信号。 低通滤波器耦合到混频器并对整流信号进行滤波以产生平均信号。 处理器耦合到低通滤波器并根据平均信号测量身体阻抗。
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