公开(公告)号：US11378686B2

公开(公告)日：2022-07-05

申请号：US16232308

申请日：2018-12-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lei Ding ,  Srinath Mathur Ramaswamy ,  Anand Dabak

IPC: G01S17/58 ,  G01S17/93 ,  G01S7/53 ,  G01S15/58 ,  G01S15/931

Abstract: An ultrasound detect circuit includes a decimator that decimates a transmit signal to be transmitted through an ultrasonic transducer. The transmit signal is decimated to generate first and second template signals. The decimator uses a different decimation ratio to generate the first template signal than the second template signal. The circuit also includes a first correlator to correlate a signal derived from the ultrasonic transducer with the first template signal, aa second correlator to correlate the signal derived from the ultrasonic transducer with the second template signal, and a Doppler shift determination circuit to determine a Doppler frequency shift based on an output from the first correlator and an output from the second correlator.

公开(公告)号：US11346941B2

公开(公告)日：2022-05-31

申请号：US16364613

申请日：2019-03-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lei Ding ,  Srinath Mathur Ramaswamy ,  Anand Gopalan ,  Michael John Zroka

IPC: G01S15/00 ,  G01S15/10 ,  G01S7/524

Abstract: Ultrasonic sensing systems and associated methods provide side-lobe reduction to improve the acoustic detection of small objects, the signature envelope peaks of which can otherwise be obscured by subsidiary envelope peaks in side lobes that result from residual correlation between a signal received by an ultrasonic transducer and a template signal corresponding to a burst signal emitted by the ultrasonic transducer. A shaping signal by which the amplitude of the burst signal can be varied with respect to time is taken into account in the template signal, and correlator circuitry correlates a signal derived from the ultrasonic transducer with the template signal to produce a correlated output exhibiting the desired side-lobe reduction. The distance from the transducer to the detected object can thereby be determined with enhanced accuracy and responsiveness.

公开(公告)号：US11171616B2

公开(公告)日：2021-11-09

申请号：US16259100

申请日：2019-01-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Aritra Banerjee ,  Rahmi Hezar ,  Lei Ding ,  Nathan Richard Schemm

IPC: H03F3/19 ,  H03F3/193 ,  H03F1/02 ,  H03F1/22 ,  H03F3/21 ,  H03F3/24 ,  H03F3/72

Abstract: A first branch group circuit includes a first branch circuit receiving a first RF input signal and first control information; and a second branch circuit receiving the first input signal and second control information. Each of the first and second branch circuits includes a power amplifier. The second control information enables the second branch circuit to be switched on or off while the first branch circuit remains on. A second branch group circuit includes: a third branch circuit receiving a second RF input signal and third control information; and a fourth branch circuit receiving the second input signal and fourth control information. Each of the third and fourth branch circuits includes a power amplifier. The fourth control information enables the fourth branch circuit to be switched on or off while the third branch circuit remains on. A combiner combines output signals of the power amplifiers to produce an output signal.

公开(公告)号：US10677902B2

公开(公告)日：2020-06-09

申请号：US15659919

申请日：2017-07-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lei Ding ,  Srinath Mathur Ramaswamy

IPC: G01S7/52 ,  G01S15/89

Abstract: An ultrasonic detection circuit includes a transmitter circuit that provides excitation signals to a terminal of an ultrasonic transducer to drive the ultrasonic transducer during an excitation interval. The excitation signals provided during the excitation interval include a first excitation signal at a first resonant frequency of the ultrasonic transducer followed by a second excitation signal at a second resonant frequency of the ultrasonic transducer. The first resonant frequency is different from the second resonant frequency.

公开(公告)号：US09705539B2

公开(公告)日：2017-07-11

申请号：US14156238

申请日：2014-01-15

Applicant: Texas Instruments Incorporated

Inventor： Fernando A Mujica ,  Lei Ding

IPC: H04K1/02 ,  H04L25/03 ,  H04L25/49 ,  H04B1/04 ,  H03F1/32 ,  H03F3/195 ,  H03F3/24

CPC classification number: H04B1/0475 ,  H03F1/3247 ,  H03F3/195 ,  H03F3/24 ,  H03F2200/451 ,  H03F2201/3212

Abstract: Embodiments of the invention provide a DPD system where the transmit reference signal is transformed, including sub-sampling, frequency translation, and the like, to match the feedback signal, which goes thru a similar transformation process, to obtain an error signal. The same transformation is applied to a system model, which may be Jacobian, Hessian, Gradient, or the like, in an adaptation algorithm to minimize error.

公开(公告)号：US09385669B2

公开(公告)日：2016-07-05

申请号：US14312239

申请日：2014-06-23

Applicant: Texas Instruments Incorporated

Inventor： Aritra Banerjee ,  Joonhoi Hur ,  Baher Haroun ,  Nathan Richard Schemm ,  Rahmi Hezar ,  Lei Ding

IPC: H03F3/217 ,  H03F3/21 ,  H03F3/193 ,  H03F1/02 ,  H03F3/45

CPC classification number: H03F1/0205 ,  H03F1/0294 ,  H03F3/193 ,  H03F3/211 ,  H03F3/217 ,  H03F3/2171 ,  H03F3/2173 ,  H03F3/2176 ,  H03F3/45179 ,  H03F2200/391 ,  H03F2200/451 ,  H03F2203/21139 ,  H03F2203/21142

Abstract: An outphasing amplifier includes a first class-E power amplifier (16-1) having an output coupled to a first conductor (31-1) and an input receiving a first RF drive signal (S1(t)). A first reactive element (CA-1) is coupled between the first conductor and a second conductor (30-1). A second reactive element (LA-1) is coupled between the second conductor and a third conductor (32-1). A second class-E power amplifier (17-1) includes an output coupled to a fourth conductor (31-2) and an input coupled to a second RF drive signal (S2(t)), a third reactive element (CA-3) coupled between the second and fourth conductors. Outputs of the first and second power amplifiers are combined by the first, second and third reactive elements to produce an output current in a load (R). An efficiency enhancement circuit (LEEC-1) is coupled between the first and fourth conductors to improve power efficiency at back-off power levels. Power enhancement circuits (20-1,2) are coupled to the first and fourth conductors, respectively.

Abstract translation: 外相放大器包括具有耦合到第一导体（31-1）的输出的第一E类功率放大器（16-1）和接收第一RF驱动信号（S1（t））的输入。 第一电抗元件（CA-1）耦合在第一导体和第二导体（30-1）之间。 第二电抗元件（LA-1）耦合在第二导体和第三导体（32-1）之间。 第二类E功率放大器（17-1）包括耦合到第四导体（31-2）的输出和耦合到第二RF驱动信号（S2（t））的输入，第三反应元件（CA-3 ）耦合在第二和第四导体之间。 第一和第二功率放大器的输出由第一，第二和第三无功元件组合以在负载（R）中产生输出电流。 效率增强电路（LEEC-1）耦合在第一和第四导体之间，以提高退避功率电平的功率效率。 功率增强电路（20-1,2）分别耦合到第一和第四导体。

公开(公告)号：US20150256216A1

公开(公告)日：2015-09-10

申请号：US14203236

申请日：2014-03-10

Applicant: Texas Instruments Incorporated

Inventor： Lei Ding ,  Rahmi Hezar

IPC: H04B1/62 ,  H04L25/49

CPC classification number: H04B1/62 ,  H03F1/3241 ,  H03F1/3247 ,  H03F3/217 ,  H04B1/0475 ,  H04B2001/0425 ,  H04L25/03012 ,  H04L25/03343 ,  H04L25/49

Abstract: A method includes receiving an input signal and predistorting a baseband representation of the input signal at a carrier frequency and at one or more harmonic frequencies. The method also includes generating an output signal based on the predistorted baseband representation of the input signal, and transmitting the output signal to a power amplifier. Predistorting the baseband representation of the input signal at the carrier frequency could occur in parallel with predistorting the baseband representation of the input signal at the one or more harmonic frequencies.

Abstract translation: 一种方法包括：以载波频率和一个或多个谐波频率接收输入信号和预失真输入信号的基带表示。 该方法还包括基于输入信号的预失真基带表示产生输出信号，并将输出信号发送到功率放大器。 以载波频率预测输入信号的基带表示可以与在一个或多个谐波频率处对输入信号的基带表示进行预失真并行发生。

公开(公告)号：US20150222463A1

公开(公告)日：2015-08-06

申请号：US14172714

申请日：2014-02-04

Applicant: Texas Instruments Incorporated

Inventor： Rahmi Hezar ,  Lei Ding ,  Baher Haroun

IPC: H04L27/20 ,  H03F3/24 ,  H03F1/02 ,  H03F3/19

CPC classification number: H04L27/3411 ,  H03F1/02 ,  H03F1/0294 ,  H03F3/19 ,  H03F3/2175 ,  H03F3/245 ,  H03F2200/331 ,  H03F2200/336 ,  H03F2200/451 ,  H04B1/02 ,  H04B14/062 ,  H04L27/2053

Abstract: At least one tone is generated. An output signal is generated in response to an input signal and the at least one tone. The output signal is modulated. The input signal and the at least one tone are represented in the modulated output signal. The at least one tone is outside a bandwidth of the input signal as represented in the modulated output signal. The modulated output signal is amplified. The at least one tone in the amplified signal is attenuated after the amplifying.

Abstract translation: 至少产生一个音调。 响应于输入信号和至少一个音调产生输出信号。 输出信号被调制。 在调制输出信号中表示输入信号和至少一个音调。 至少一个音调在调制输出信号所表示的输入信号的带宽之外。 调制输出信号被放大。 放大信号中的至少一个音调在放大后衰减。

公开(公告)号：US20150070088A1

公开(公告)日：2015-03-12

申请号：US14020242

申请日：2013-09-06

Applicant: Texas Instruments Incorporated

Inventor： Lei Ding ,  Rahmi Hezar ,  Joonhoi Hur

IPC: H03H17/06

CPC classification number: H03K7/08

Abstract: A method of canceling nonlinear distortions in pulse width modulated signals includes receiving an input signal. A first signal that is the modulated input signal is generated. The first signal has quantized levels representing the input signal. A pulse width modulated (PWM) sequence that is representative of the first signal is generated. A second signal that is the PWM sequence mixed with a carrier signal is generated. An error signal is generated in response to the first signal and modeled from the second signal. The error signal is added to the input signal.

Abstract translation: 消除脉宽调制信号中的非线性失真的方法包括接收输入信号。 产生作为调制输入信号的第一信号。 第一信号具有表示输入信号的量化电平。 产生代表第一信号的脉冲宽度调制（PWM）序列。 产生与载波信号混合的PWM序列的第二信号。 响应于第一信号产生误差信号并从第二信号建模。 误差信号加到输入信号上。

公开(公告)号：US11733377B2

公开(公告)日：2023-08-22

申请号：US16364652

申请日：2019-03-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Lei Ding ,  Srinath Mathur Ramaswamy ,  Anand Gopalan ,  Vaibhav Garg ,  Anand Ganesh Dabak ,  Baher S. Haroun

IPC: G01S15/10 ,  G01S15/931 ,  G01S15/32 ,  G01S15/58

CPC classification number: G01S15/104 ,  G01S15/325 ,  G01S15/582 ,  G01S15/931 ,  G01S2015/938

Abstract: In an ultrasonic detection system that uses frequency-modulation or phase-modulation coding to distinguish emitted bursts from multiple transducers, a receiver associated with a transducer uses peak search, peak buffer, and peak rank stages in one or more receiver signal processing paths to identify valid received ultrasonic signal envelope peaks in correlator outputs. The peak rank stage can support different modes respectively designed to handle one code, two or more codes, or two or more codes with support for Doppler frequency shift detection. Valid peak information (e.g., amplitude and time) can be reported to a central controller and/or stored locally in a fusion stage to generate more intelligent information for targets or obstacles using peaks from multiple bursts.