公开(公告)号：US11105676B2

公开(公告)日：2021-08-31

申请号：US16191430

申请日：2018-11-14

Applicant: Texas Instruments Incorporated

Inventor： Michael Zwerg ,  Sudhanshu Khanna ,  Steven C. Bartling ,  Brian Elies ,  Krishnasawamy Nagaraj ,  Wei-Yan Shih

IPC: G01H11/08

Abstract: In described examples, each node between adjacent capacitive elements of a stack of series-coupled capacitive elements is biased during a reset mode, where each of the capacitive elements includes piezoelectric material. A strain-induced voltage is generated across each of the capacitive elements. Each of the strain-induced voltages is combined to generate a piezoelectric-responsive output signal during a sensing mode at a time different from the time of the reset mode.

公开(公告)号：US20200168786A1

公开(公告)日：2020-05-28

申请号：US16201808

申请日：2018-11-27

Applicant: Texas Instruments Incorporated

Inventor： Sudhanshu Khanna ,  Michael Zwerg ,  Steven C. Bartling ,  Brian Elies ,  Krishnasawamy Nagaraj ,  Wei-Yan Shih

IPC: H01L41/08 ,  H01L41/107 ,  H01L41/04 ,  H01L41/047

Abstract: An improved differential sensor and corresponding apparatus implementing same. The differential sensor includes a substrate, an amplifier coupled to the substrate, and a plurality of highly-matched piezoelectric capacitors formed onto the substrate. A first set of the highly-matched piezoelectric capacitors are electrically coupled to a non-inverting input of the amplifier, and a second set of the highly-matched piezoelectric capacitors are electrically coupled to an inverting input of the amplifier to form an open loop differential amplifier.

公开(公告)号：US10466286B2

公开(公告)日：2019-11-05

申请号：US15845898

申请日：2017-12-18

Applicant: Texas Instruments Incorporated

Inventor： Krishnasawamy Nagaraj ,  Paul Kimelman ,  Abhijit Kumar Das

IPC: G01R27/26

Abstract: A system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, and the controller causing the time period for capacitance measurements to vary even when the capacitance is constant.

公开(公告)号：US10422822B2

公开(公告)日：2019-09-24

申请号：US16048559

申请日：2018-07-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Krishnasawamy Nagaraj ,  Paul Kimelman ,  Abhijit Kumar Das

IPC: G01R27/26

Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, a noise measurement circuit configured to measure electrical noise on the node, and the controller receiving the measurement of noise from the noise measurement circuit.

公开(公告)号：US10060959B2

公开(公告)日：2018-08-28

申请号：US14189461

申请日：2014-02-25

Applicant: Texas Instruments Incorporated

Inventor： Krishnasawamy Nagaraj ,  Paul Kimelman ,  Abhijit Kumar Das

IPC: G01R27/26 ,  G01R29/26

Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, a noise measurement circuit configured to measure electrical noise on the node, and the controller receiving the measurement of noise from the noise measurement circuit.

公开(公告)号：US20180106844A1

公开(公告)日：2018-04-19

申请号：US15845898

申请日：2017-12-18

Applicant: Texas Instruments Incorporated

Inventor： Krishnasawamy Nagaraj ,  Paul Kimelman ,  Abhijit Kumar Das

IPC: G01R27/26

Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, and the controller causing the time period for capacitance measurements to vary even when the capacitance is constant.

公开(公告)号：US20140239983A1

公开(公告)日：2014-08-28

申请号：US14189447

申请日：2014-02-25

Applicant: Texas Instruments Incorporated

Inventor： Krishnasawamy Nagaraj ,  Paul Kimelman ,  Abhijit Kumar Das

IPC: G01R27/26

CPC classification number: G01R27/2605

Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, and the controller causing the time period for capacitance measurements to vary even when the capacitance is constant.

Abstract translation: 电容感测系统包括控制器，连接到电容的一侧的节点，所述控制器被配置为通过测量电容两端的电压达到预定参考电压的时间来测量电容，并且所述控制器使所述时间段 即使电容不变，电容测量也会发生变化。

公开(公告)号：US20140239977A1

公开(公告)日：2014-08-28

申请号：US14189461

申请日：2014-02-25

Applicant: Texas Instruments Incorporated

Inventor： Krishnasawamy Nagaraj ,  Paul Kimelman ,  Abhijit Kumar Das

IPC: G01R27/26 ,  G01R29/26

CPC classification number: G01R27/2605

Abstract: A capacitive sensing system includes a controller, a node connected to one side of a capacitance, the controller configured to measure the capacitance by measuring a time for a voltage across the capacitance to reach a predetermined reference voltage, a noise measurement circuit configured to measure electrical noise on the node, and the controller receiving the measurement of noise from the noise measurement circuit.

Abstract translation: 电容感测系统包括控制器，连接到电容的一侧的节点，所述控制器被配置为通过测量跨过电容的电压的时间来测量电容以达到预定的参考电压;噪声测量电路，被配置为测量电 节点上的噪声，以及从噪声测量电路接收噪声测量的控制器。