公开(公告)号：US20200336163A1

公开(公告)日：2020-10-22

申请号：US16838685

申请日：2020-04-02

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jaiganesh Balakrishnan

IPC: H04B1/12 ,  H04B1/16 ,  H04H40/72 ,  H04B17/318 ,  H04B17/20 ,  H04B17/336 ,  H04B1/10

Abstract: A wireless receiver (10) includes a down converter module (210) operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module (200) having a filter bandwidth and fed by said down converter module (210), and a measurement module (295) operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module (200) responsive to said measurement module (295) to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module (200) is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.

公开(公告)号：US10483997B1

公开(公告)日：2019-11-19

申请号：US16281862

申请日：2019-02-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Aravind Ganesan ,  Jaiganesh Balakrishnan ,  Sashidharan Venkatraman ,  Bragadeesh Suresh Babu

IPC: H03M1/12 ,  H03M1/06

Abstract: A method for frequency domain to time domain conversion includes receiving a set of frequency-domain samples. Based on the set of frequency-domain samples, a first sample subset comprising a predetermined fraction of the number of samples of the set of frequency-domain samples and a second sample subset comprising the predetermined fraction of the number of samples of the set of frequency-domain samples are generated. A linear phase rotation is applied to the first sample subset and the second sample subset to produce a phase rotated first sample subset and a phase rotated second sample subset. The phase rotated first sample set is post-processed to generate a first set of time-domain samples. The phase rotated second sample set is post-processed to generate a second set of time-domain samples. The first set of time-domain samples and the second set of time-domain samples are reordered to produce an output set of time-domain samples.

公开(公告)号：US10090866B2

公开(公告)日：2018-10-02

申请号：US15395135

申请日：2016-12-30

Applicant: Texas Instruments Incorporated

Inventor： Jaiganesh Balakrishnan ,  Suvam Nandi ,  Sundarrajan Rangachari

IPC: G06F17/17 ,  H04B1/00 ,  H04B1/04 ,  H04B1/10 ,  G06F5/01 ,  H03H17/02

Abstract: A digital filter for interpolation or decimation and a device incorporating the digital filter is disclosed. The digital filter includes a filter block, a first transformation circuit coupled to the filter block and an input stream coupled to provide input values to a component selected from the filter block and the first transformation circuit. The filter block includes a pair of sub-filters having respective transformed coefficients, the respective transformed coefficients of a first sub-filter of the pair of sub-filters being symmetric and the respective transformed coefficients of a second sub-filter of the pair of sub-filters being anti-symmetric. The first transformation circuit is coupled to perform a first transformation; the filter block and the first transformation circuit together provide suppression of undesired spectral images in final outputs of the digital filter.

公开(公告)号：US20180227157A1

公开(公告)日：2018-08-09

申请号：US15942614

申请日：2018-04-02

Applicant: Texas Instruments Incorporated

Inventor： Jaiganesh Balakrishnan ,  Sarma Sundareswara Gunturi ,  Pankaj Gupta ,  Indu Prathapan

IPC: H04L27/26

CPC classification number: H04L27/2624

Abstract: The disclosure provides a circuit. The circuit includes an IFFT (inverse fast fourier transform) block. The IFFT block generates a modulated signal in response to a data signal. A clip logic block is coupled to the IFFT block, and generates a clipped signal in response to the modulated signal. A first subtractor is coupled to the clip logic block and the IFFT block, and subtracts the modulated signal from the clipped signal to generate an error signal. A cyclic filter is coupled to the first subtractor, and filters the error signal to generate a filtered error signal. A second subtractor is coupled to the cyclic filter and the IFFT block. The second subtractor subtracts the filtered error signal from the modulated signal to generate a processed signal.

公开(公告)号：US09813072B2

公开(公告)日：2017-11-07

申请号：US15145375

申请日：2016-05-03

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sthanunathan Ramakrishnan ,  Sashidharan Venkatraman ,  Jaiganesh Balakrishnan

IPC: H03M1/06 ,  H03M1/12 ,  H03M1/10

CPC classification number: H03M1/0626 ,  H03M1/1009 ,  H03M1/1215

Abstract: Methods, apparatus, systems and articles of manufacture to increase an integrity of mismatch corrections in an interleaved analog to digital converter are disclosed. An example apparatus includes an instantaneous mismatch estimator that uses an output of an interleaved analog to digital converter to identify a mismatch estimate between two or more component analog to digital converters of the interleaved analog to digital converter. An integrity monitor is to cause the instantaneous mismatch estimator to avoid incorrectly providing the mismatch estimate to a filter, the integrity monitor to instruct the filter to remove the mismatch estimate when the mismatch estimate is detected to be inaccurate.

公开(公告)号：US09762254B2

公开(公告)日：2017-09-12

申请号：US15230643

申请日：2016-08-08

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sashidharan Venkatraman ,  Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan

IPC: H03M1/06 ,  H03M1/10 ,  H03M1/12

CPC classification number: H03M1/0624 ,  H03M1/0626 ,  H03M1/1009 ,  H03M1/1215

Abstract: A system includes a first tracking filter configured to track a frequency domain mismatch profile between component analog-to-digital convertors (ADCs) of an interleaved ADC (IADC), and a second tracking filter configured to a track a frequency independent timing delay mismatch and a timing delay mismatch correction error based on frequency domain mismatch profile estimates. An output of the first tracking filter determines a correction of a frequency dependent mismatch profile in an output of the interleaved ADC and an output of the second tracking filter determines a correction of the timing delay mismatch correction error in the output of the interleaved ADC.

公开(公告)号：US09374678B2

公开(公告)日：2016-06-21

申请号：US14194449

申请日：2014-02-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Pankaj Gupta ,  Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan ,  Sachin Bhardwaj

IPC: H04W4/04

CPC classification number: H04W4/043

Abstract: Several systems and methods for location estimation in a multi-floor environment are disclosed. In an embodiment, the method includes performing wireless scanning so as to receive wireless signals from one or more access points from among a plurality of access points positioned at plurality of locations, respectively at one or more floors from among a plurality of floors within the multi-floor environment. A first set of RSSI measurements is computed corresponding to the wireless signals. Absolute floor location information is determined based on the first set of RSSI measurements and a pre-defined objective function. The pre-defined objective function is configured to maximize a probability of a user being located at a floor so as to receive the wireless signals. A user floor location is determined based on the absolute floor location information. The user location is estimated at least in part based on the user floor location.

Abstract translation: 公开了用于多层环境中的位置估计的几种系统和方法。 在一个实施例中，该方法包括执行无线扫描，以便从位于多个接入点内的多个接入点中的多个接入点接收无线信号，所述多个接入点分别位于多个接入点内的多个接入点 - 地板环境。 对应于无线信号计算第一组RSSI测量。 基于第一组RSSI测量和预定义的目标函数来确定绝对楼层位置信息。 预定义的目标函数被配置为最大化用户位于楼层的概率以便接收无线信号。 基于绝对楼层位置信息确定用户楼层位置。 至少部分地基于用户楼层位置来估计用户位置。

公开(公告)号：US20160165536A1

公开(公告)日：2016-06-09

申请号：US14560011

申请日：2014-12-04

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sriram Murali ,  Sarma Gunturi ,  Jaiganesh Balakrishnan ,  Murugesh Subramaniam ,  Harikrishna Parthasarathy

IPC: H04W52/02 ,  H04W72/04 ,  H04L5/16

CPC classification number: H04W52/028 ,  H04B1/44 ,  H04L5/16 ,  H04L25/4902 ,  H04L27/14 ,  H04W76/28 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/168

Abstract: Circuits and methods for reducing power consumption in a half-duplex transceiver are disclosed. In an embodiment, a power management circuit of half-duplex transceiver includes direct current to direct current (DC-DC) converter and snooze mode controller. The DC-DC converter includes switching circuit and driver circuit to drive the switching circuit. The DC-DC converter provides power supply to at least one element of a transmitter sub-system of the half-duplex transceiver, and operates in snooze control modes. The snooze mode controller is coupled to the DC-DC converter and configured to generate a control signal based on at least one transceiver operating input, where the control signal causes the DC-DC converter to operate in one of the snooze control modes, the snooze control modes corresponding to snooze duty cycles and where in each snooze control mode, the switching circuit and the driver circuit remain in an OFF-state based on a respective snooze duty cycle.

Abstract translation: 公开了一种用于降低半双工收发器功耗的电路和方法。 在一个实施例中，半双工收发器的功率管理电路包括直流到直流（DC-DC）转换器和打盹模式控制器。 DC-DC转换器包括开关电路和驱动电路来驱动开关电路。 DC-DC转换器为半双工收发器的发射机子系统的至少一个元件提供电源，并且以贪睡控制模式操作。 打盹模式控制器耦合到DC-DC转换器，并被配置为基于至少一个收发器操作输入产生控制信号，其中控制信号使DC-DC转换器以打盹控制模式之一进行操作，打盹 对应于打盹占空比的控制模式，并且在每个打盹控制模式中，基于相应的打盹占空比，开关电路和驱动电路保持在OFF状态。

公开(公告)号：US20160003622A1

公开(公告)日：2016-01-07

申请号：US14323823

申请日：2014-07-03

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： JAYAWARDAN JANARDHANAN ,  Jaiganesh Balakrishnan

IPC: G01C21/12 ,  G01P15/08

CPC classification number: G01C21/12 ,  A61B5/112 ,  A61B2562/0219 ,  G01C21/16 ,  G01C22/006 ,  G01P15/18

Abstract: Devices and methods for pedestrian navigation are disclosed. In an embodiment, a device includes an accelerometer sensor configured to sense acceleration components associated with a device motion in a plurality of axes of the accelerometer sensor. The acceleration components include stride frequency components and step frequency components. The device includes a processing module communicably associated with the accelerometer sensor. The processing module is configured to process at least a portion of the acceleration components to determine an estimated attitude associated with the device motion with respect to the accelerometer sensor. The processing module is configured to filter out the step frequency components by blocking the stride frequency components. The processing module is further configured to determine the estimated attitude based on the step frequency components to thereby mitigate a bias in the estimated attitude associated with a lateral sway of the device motion.

Abstract translation: 公开了用于行人导航的装置和方法。 在一个实施例中，设备包括加速度传感器，其配置成感测与加速度计传感器的多个轴中的设备运动相关联的加速度分量。 加速度分量包括步幅频率分量和步进频率分量。 该装置包括与加速度计传感器可通信地相关联的处理模块。 所述处理模块被配置为处理所述加速度分量的至少一部分以确定与所述加速度计传感器相关的装置运动的估计姿态。 处理模块被配置为通过阻止步幅频率分量来滤除步进频率分量。 处理模块还被配置为基于步进频率分量来确定估计姿态，从而减轻与装置运动的横向摆动相关联的估计姿态的偏差。

公开(公告)号：US08774933B2

公开(公告)日：2014-07-08

申请号：US14019113

申请日：2013-09-05

Applicant: Texas Instruments Incorporated

Inventor： Sthanunathan Ramakrishnan ,  Jaiganesh Balakrishnan

IPC: A61N1/18

CPC classification number: A61N1/37252 ,  A61N1/08 ,  A61N1/37211

Abstract: By a medical implant transceiver implantable within a body of a living organism, a portion of a signal is received from a medical controller transceiver external to the body of the living organism. Based on directions within the portion of the signal, a time duration is determined, after which a subsequent portion of the signal is to be transmitted from the medical controller transceiver. The directions include a value indicative of the time duration. The time duration differs based on the value. The subsequent portion is to be transmitted from the medical controller transceiver after an end of the portion. The medical implant transceiver enters into an inactive state for the time duration and awakens after the time duration has elapsed.

Abstract translation: 通过可植入在活体内的医疗植入物收发器，信号的一部分从生物体的身体外部的医疗控制收发器接收。 基于信号部分内的方向，确定持续时间，之后从医疗控制收发器发送信号的后续部分。 方向包括指示持续时间的值。 持续时间根据值而不同。 在部分结束之后，将从医疗控制器收发器发送随后的部分。 医疗植入物收发器在持续时间内进入非活动状态，并在持续时间过去后唤醒。