公开(公告)号：US20230179215A1

公开(公告)日：2023-06-08

申请号：US17541781

申请日：2021-12-03

Applicant: Texas Instruments Incorporated

Inventor： Jayawardan Janardhanan ,  Yogesh Darwhekar ,  Subhashish Mukherjee

IPC: H03M1/10

CPC classification number: H03M1/1014

Abstract: A system includes a first digital-to-time converter (DTC) adapted to receive a first DTC code and a first clock signal. The first DTC provides an output clock signal. The system includes a calibration DTC adapted to receive a calibration DTC code and a second clock signal. The calibration DTC provides a calibration output signal. The system includes a latch comparator which provides outputs indicative of which of the output clock signal and the calibration output signal is received first. The system includes an average computation module which provides an average value of the outputs of the latch comparator. The system includes a digital controller adapted to receive the average value. The digital controller provides the DTC code and the calibration DTC code.

公开(公告)号：US11290118B2

公开(公告)日：2022-03-29

申请号：US17128791

申请日：2020-12-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Srinivas Theertham ,  Jagdish Chand ,  Yogesh Darwhekar ,  Subhashish Mukherjee ,  Jayawardan Janardhanan ,  Uday Kiran Meda ,  Arpan Sureshbhai Thakkar ,  Apoorva Bhatia ,  Pranav Kumar

IPC: H03L7/23 ,  H03M1/66 ,  H03L7/085 ,  H03L7/099

Abstract: A frequency synthesizer includes a phase-locked loop (PLL). The PLL includes a first voltage-controlled oscillator (VCO) and a second VCO, each comprising an oscillator, a capacitor bank, and a bias circuit. The capacitor bank is configured to selectably adjust an output frequency of the oscillator. The bias circuit is configured to provide a bias current to the oscillator, and includes a current digital-to-analog converter (IDAC), and an amplifier coupled to the IDAC and configured to drive the oscillator.

公开(公告)号：US09360324B1

公开(公告)日：2016-06-07

申请号：US14804544

申请日：2015-07-21

Applicant: Texas Instruments Incorporated

Inventor： Jayawardan Janardhanan ,  Goutam Dutta ,  Varun Tripuraneni

IPC: G01C21/16 ,  G01C22/00

CPC classification number: G01C21/16 ,  G01C21/165 ,  G01C21/20 ,  G01C22/006

Abstract: A user-heading determining system (10) for pedestrian use includes a multiple-axis accelerometer (110) having acceleration sensors; a device-heading sensor circuit (115) physically situated in a fixed relationship to the accelerometer (110); an electronic circuit (100) operable to generate signals representing components of acceleration sensed by the accelerometer (110) sensors, and to electronically process at least some part of the signals to produce an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation (750, α) with a device heading estimation (770, ψ) responsive to the device-heading sensor circuit, to produce a user heading estimation (780); and an electronic display (190) responsive to the electronic circuit (100) to display information at least in part based on the user heading estimation. Other systems, circuits and processes are also disclosed.

Abstract translation: 用于行人使用的用户航向确定系统（10）包括具有加速度传感器的多轴加速度计（110） 物理地位于与所述加速度计（110）固定关系的设备航向传感器电路（115）; 电子电路（100），其可操作以产生表示由所述加速度计（110）传感器感测到的加速度的分量的信号，并且电子处理所述信号的至少一部分以产生相对于所述加速度计的用户运动姿态的估计， 并且进一步将所述姿态估计（750，α）与响应于所述设备航向传感器电路的设备航向估计（770，ψ）组​​合以产生用户航向估计（780）; 以及响应于所述电子电路（100）至少部分地基于所述用户标题估计来显示信息的电子显示器（190）。 还公开了其它系统，电路和过程。

公开(公告)号：US10516401B2

公开(公告)日：2019-12-24

申请号：US16214179

申请日：2018-12-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jayawardan Janardhanan ,  Eric Paul Lindgren ,  Henry Yao

IPC: H03L7/081 ,  H03L7/10

Abstract: A circuit includes a time-to-digital converter (TDC) to produce an output signal that is a function of a time difference between a first input clock to the TDC and a second input clock to the TDC. A first delay line is also included to add a time delay to a third clock to produce the first input clock. A pseudo random binary sequence generator generates a pseudo random binary bit sequence to be used to vary the amount of time delay added by the first delay line to the third clock.

公开(公告)号：US20180100749A1

公开(公告)日：2018-04-12

申请号：US15845984

申请日：2017-12-18

Applicant: Texas Instruments Incorporated

Inventor： Deric Wayne Waters ,  Jayawardan Janardhanan ,  Saket Thukral

IPC: G01C23/00 ,  G01C21/16 ,  G01D18/00 ,  H04N5/232 ,  G08B21/04 ,  G01S19/49 ,  G01S19/48 ,  G01S19/47 ,  G01S19/34 ,  A61B8/00 ,  A61B8/08 ,  A61B5/053 ,  A61B5/00 ,  H04N7/18

Abstract: A system comprises a plurality of sensors, a sensor processor, and a sampling rate engine. The sensor processor is coupled to an output of each sensor of the plurality of sensors. The sensor processor estimates user dynamics in response to a first output signal of a first sensor of the plurality of sensors. The sampling rate engine is coupled to an output of the sensor processor. The sampling rate engine determines a sampling rate value of a second sensor of the plurality of sensors in response to a user dynamics value from the sensor processor. The second sensor comprises a selectable sampling rate. The selectable sampling rate is configured in response to the sampling rate value determined by the sampling rate engine.

公开(公告)号：US09677905B2

公开(公告)日：2017-06-13

申请号：US14830170

申请日：2015-08-19

Applicant: Texas Instruments Incorporated

Inventor： Deric Wayne Waters ,  Jayawardan Janardhanan ,  Saket Thukral

IPC: G01C23/00 ,  G01D18/00 ,  G01C21/16 ,  A61B8/00 ,  A61B8/08 ,  G01S19/48 ,  G06F19/00 ,  A61B5/00 ,  G01S19/47 ,  G01S19/49 ,  G08B21/04 ,  G01S19/34 ,  A61B5/053 ,  H04N5/232 ,  H04N7/18 ,  G06F1/32 ,  G06K9/62

CPC classification number: G01C23/00 ,  A61B5/0006 ,  A61B5/0022 ,  A61B5/0537 ,  A61B8/488 ,  A61B8/565 ,  G01C21/16 ,  G01D18/00 ,  G01S19/34 ,  G01S19/47 ,  G01S19/48 ,  G01S19/49 ,  G06F1/32 ,  G06F19/3418 ,  G06K9/62 ,  G08B21/0423 ,  G16H15/00 ,  G16H20/30 ,  G16H40/40 ,  H04N5/232 ,  H04N5/23241 ,  H04N7/18

Abstract: Method including detecting low user dynamics by a first MEMS sensor is provided. A first sensor determines sampling rate value corresponding to the low user dynamics. The first sensor sampling rate value is less than a second sensor sampling rate value corresponding to high user dynamics. A sampling rate of a second MEMS sensor is adjusted to the first sensor sampling rate value.

公开(公告)号：US20160138923A1

公开(公告)日：2016-05-19

申请号：US14804544

申请日：2015-07-21

Applicant: Texas Instruments Incorporated

Inventor： Jayawardan Janardhanan ,  Goutam Dutta ,  Varun Tripuraneni

IPC: G01C21/16

CPC classification number: G01C21/16 ,  G01C21/165 ,  G01C21/20 ,  G01C22/006

Abstract: A user-heading determining system (10) for pedestrian use includes a multiple-axis accelerometer (110) having acceleration sensors; a device-heading sensor circuit (115) physically situated in a fixed relationship to the accelerometer (110); an electronic circuit (100) operable to generate signals representing components of acceleration sensed by the accelerometer (110) sensors, and to electronically process at least some part of the signals to produce an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation (750, α) with a device heading estimation (770, ψ) responsive to the device-heading sensor circuit, to produce a user heading estimation (780); and an electronic display (190) responsive to the electronic circuit (100) to display information at least in part based on the user heading estimation. Other systems, circuits and processes are also disclosed.

Abstract translation: 用于行人使用的用户航向确定系统（10）包括具有加速度传感器的多轴加速度计（110） 物理地位于与所述加速度计（110）固定关系的设备航向传感器电路（115）; 电子电路（100），其可操作以产生表示由所述加速度计（110）传感器感测到的加速度的分量的信号，并且电子处理所述信号的至少一部分以产生相对于所述加速度计的用户运动姿态的估计， 并且进一步将所述姿态估计（750，α）与响应于所述设备航向传感器电路的设备航向估计（770，ψ）组​​合以产生用户航向估计（780）; 以及响应于所述电子电路（100）至少部分地基于所述用户标题估计来显示信息的电子显示器（190）。 还公开了其它系统，电路和过程。

公开(公告)号：US20150198695A1

公开(公告)日：2015-07-16

申请号：US14665851

申请日：2015-03-23

Applicant: Texas Instruments Incorporated

Inventor： Deric Wayne Waters ,  Jayawardan Janardhanan

IPC: G01S5/02 ,  G01S19/03

CPC classification number: G01S19/48 ,  G01S5/0252 ,  G01S5/0263 ,  G01S5/14 ,  G01S19/03 ,  G01S19/46

Abstract: A wireless device for indoor positioning has a satellite positioning system, a transceiver, a motion measurement system, and a position estimation system. The satellite positioning system is configured to determine a location of the device based on received satellite positioning signals. The wireless local area network transceiver is configured to measure while in the areas of non-reception, signals transmitted by wireless local area network (WLAN) access points (APs). The motion measurement system is configured to measure movement of the wireless device. The position estimation system is configured to determine a reference location, and record measurements of movement. The reference location and the recorded measurements are to be provided to a positioning database that generates a positioning grid.

Abstract translation: 用于室内定位的无线设备具有卫星定位系统，收发器，运动测量系统和位置估计系统。 卫星定位系统被配置为基于接收到的卫星定位信号来确定设备的位置。 无线局域网收发器被配置为在非接收区域测量，由无线局域网（WLAN）接入点（AP）发送的信号。 运动测量系统被配置成测量无线设备的移动。 位置估计系统被配置为确定参考位置，并且记录运动的测量。 将参考位置和记录的测量值提供给产生定位网格的定位数据库。

公开(公告)号：US20150198694A1

公开(公告)日：2015-07-16

申请号：US14667348

申请日：2015-03-24

Applicant: Texas Instruments Incorporated

Inventor： Deric Wayne Waters ,  Jayawardan Janardhanan

IPC: G01S5/02 ,  G01S5/14

CPC classification number: G01S19/48 ,  G01S5/0252 ,  G01S5/0263 ,  G01S5/14 ,  G01S19/03 ,  G01S19/46

Abstract: A positioning server has a positioning database. The positioning database is configured to store information relating wireless local area network (WLAN) access point (AP) signal measurements to points of a geographic positioning grid. motion information provided by dead-reckoning systems of a plurality of wireless devices and reference location information provided by at least one of a satellite positioning system and a wireless local area network (WLAN) positioning system of each wireless device is also stored. WLAN access point (AP) signal measurements acquired by each wireless device in correspondence with the motion information is stored as are non-causally determine positions of the wireless devices based on the motion information and reference locations. Positioning server is also configured to generate a geographic positioning grid that relates the AP signal measurements to points of the positioning grid based on the determined positions.

Abstract translation: 定位服务器具有定位数据库。 定位数据库被配置为将关于无线局域网（WLAN）接入点（AP）信号测量的信息存储在地理定位网格的点上。 还存储由多个无线设备的推算系统提供的运动信息和由每个无线设备的卫星定位系统和无线局域网（WLAN）定位系统中的至少一个提供的参考位置信息。 根据运动信息和参考位置非根本地确定无线设备的位置，存储与运动信息相对应的每个无线设备获取的WLAN接入点（AP）信号测量。 定位服务器还被配置为基于确定的位置生成将AP信号测量与定位网格的点相关联的地理定位网格。

公开(公告)号：US20150088419A1

公开(公告)日：2015-03-26

申请号：US14034486

申请日：2013-09-23

Applicant: Texas Instruments Incorporated

Inventor： Sachin Bhardwaj ,  Sriram Murali ,  Jaiganesh Balakrishnan ,  Jayawardan Janardhanan ,  Yogesh Shekar ,  Goutam Dutta

IPC: G01C21/16 ,  G01C21/20

CPC classification number: G01C21/165 ,  G01C21/16 ,  G01C21/20

Abstract: According to an aspect of the present disclosure, the relative attitude between an inertial measurement unit (IMU), present on a mobile device, and the frame of reference of the vehicle carrying mobile device is estimated. The estimated relative attitude is used to translate the IMU measurement to the vehicle frame of reference to determine the velocity and position of the vehicle. As a result, the vehicle position and velocity are determined accurately in the event of undocking and re-docking of the mobile device from a docking system in the vehicle. The relative attitude is estimated in terms of pitch, roll, and yaw angles.

Abstract translation: 根据本公开的一个方面，估计出现在移动设备上的惯性测量单元（IMU）与携带移动设备的车辆的参考系之间的相对姿态。 估计的相对姿态用于将IMU测量值转换为车辆参考系，以确定车辆的速度和位置。 结果，在移动设备从车辆中的对接系统脱离和重新对接的情况下，准确地确定车辆位置和速度。 根据俯仰角，俯仰角和偏航角估计相对姿态。