公开(公告)号：US09209791B2

公开(公告)日：2015-12-08

申请号：US14020242

申请日：2013-09-06

Applicant: Texas Instruments Incorporated

Inventor： Lei Ding ,  Rahmi Hezar ,  Joonhoi Hur

IPC: H03K7/08

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：US20140133602A1

公开(公告)日：2014-05-15

申请号：US14156238

申请日：2014-01-15

Applicant: Texas Instruments Incorporated

Inventor： Fernando A. Mujica ,  Lei Ding

IPC: H04B1/04

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.

Abstract translation: 本发明的实施例提供了一种DPD系统，其中发射参考信号被变换，包括子采样，频率转换等，以与通过类似变换过程的反馈信号匹配以获得误差信号。 在适应算法中，将系统模型应用于Jacobian，Hessian，Gradient等系统模型，以使误差最小化。

公开(公告)号：US10193508B2

公开(公告)日：2019-01-29

申请号：US14255164

申请日：2014-04-17

Applicant: Texas Instruments Incorporated

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

IPC: H03F3/217 ,  H03F3/193 ,  H03F1/02 ,  H03F1/22 ,  H03F3/21 ,  H03F3/24 ,  H03F3/72

Abstract: A multi-level, multi-branch outphasing amplifier (20-1) includes a first branch group circuit (22-1) including a first branch circuit (11) receiving a first RF input signal (S1(t)) and first control information (S11_Ctrl=VDD) and a second branch circuit (12) receiving the first input signal and second control information (S12_Ctrl). Each of the first (11) and second (12) 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 (12) remains on. A second branch group circuit (22-2) includes a third branch circuit (21) receiving a second RF input signal (S2(t)) and third control information (S21_Ctrl=VDD) and a fourth branch circuit (22) receiving the second input signal (S2(t)) and fourth control information (S22_Ctrl). 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 (24) combines output signals of the power amplifiers to produce an output signal (SOUT(t)).

公开(公告)号：US20160268974A1

公开(公告)日：2016-09-15

申请号：US15165339

申请日：2016-05-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

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

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

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：US20160028433A1

公开(公告)日：2016-01-28

申请号：US14876310

申请日：2015-10-06

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.

公开(公告)号：US09184784B2

公开(公告)日：2015-11-10

申请号：US14203236

申请日：2014-03-10

Applicant: Texas Instruments Incorporated

Inventor： Lei Ding ,  Rahmi Hezar

IPC: H04L25/03 ,  H04B1/62 ,  H04L25/49 ,  H04B1/04

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：US20150303961A1

公开(公告)日：2015-10-22

申请号：US14255164

申请日：2014-04-17

Applicant: Texas Instruments Incorporated

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

IPC: H04B1/16 ,  H04B1/12 ,  H04B1/18

CPC classification number: H03F3/193 ,  H03F1/0277 ,  H03F1/0294 ,  H03F1/223 ,  H03F3/211 ,  H03F3/245 ,  H03F3/72 ,  H03F2200/411 ,  H03F2200/511 ,  H03F2200/541 ,  H03F2203/21136 ,  H03F2203/21142 ,  H03F2203/7215 ,  H03F2203/7236

Abstract: A multi-level, multi-branch outphasing amplifier (20-1) includes a first branch group circuit (22-1) including a first branch circuit (11) receiving a first RF input signal (S1(t)) and first control information (S11—Ctrl=VDD) and a second branch circuit (12) receiving the first input signal and second control information (S12—Ctrl). Each of the first (11) and second (12) 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 (12) remains on. A second branch group circuit (22-2) includes a third branch circuit (21) receiving a second RF input signal (S2(t)) and third control information (S21—Ctrl=VDD) and a fourth branch circuit (22) receiving the second input signal (S2(t)) and fourth control information (S22—Ctrl). 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 (24) combines output signals of the power amplifiers to produce an output signal (SOUT(t)).

Abstract translation: 多级多分支外延放大器（20-1）包括：第一分支组电路（22-1），包括接收第一RF输入信号（S1（t））的第一分支电路（11）和第一分支组电路 （S11-Ctrl = VDD）和接收第一输入信号的第二分支电路（12）和第二控制信息（S12-Ctrl）。 第一（11）和第二（12）分支电路中的每一个包括功率放大器。 第二控制信息使第二分支电路在第一分支电路（12）保持接通时被接通或断开。 第二分支组电路（22-2）包括接收第二RF输入信号（S2（t））和第三控制信息（S21-Ctrl = VDD）的第三分支电路（21）和接收第二分支电路 第二输入信号（S2（t））和第四控制信息（S22-Ctrl）。 第三和第四分支电路中的每一个包括功率放大器。 第四控制信息使第四分支电路在第三分支电路保持接通时被接通或断开。 组合器（24）组合功率放大器的输出信号以产生输出信号（SOUT（t））。

公开(公告)号：US20150180692A1

公开(公告)日：2015-06-25

申请号：US14136156

申请日：2013-12-20

Applicant: Texas Instruments Incorporated

Inventor： Rahmi Hezar ,  Lei Ding ,  Joonhoi Hur

IPC: H04L27/20 ,  H04B1/04

CPC classification number: H04B1/04 ,  H03F1/0294 ,  H03F3/2175 ,  H03F3/24 ,  H04L27/206 ,  H04L27/2602

Abstract: For generating quantized signals, a quantized phase domain related to quantized phases of an input signal is generated. Vectors that the input signal may occupy are calculated based on the quantized phase domain. A first quantized phase of a first component of the input signal is generated per the quantized phase domain, and a second quantized phase of a second component of the input signal is generated per the quantized phase domain.

Abstract translation: 为了产生量化信号，产生与输入信号的量化相位相关的量化相位域。 基于量化相位域计算输入信号可能占据的矢量。 每个量化相位域产生输入信号的第一分量的第一量化相位，并且每个量化相位域产生输入信号的第二分量的第二量化相位。

公开(公告)号：US20150030099A1

公开(公告)日：2015-01-29

申请号：US13949345

申请日：2013-07-24

Applicant: Texas Instruments Incorporated

Inventor： Lei Ding ,  Rahmi Hezar ,  Zigang Yang

IPC: H04L27/26

CPC classification number: H04L27/2623

Abstract: For crest factor reduction in a first signal having first and second components, the first component is delayed. A second signal is generated in response to detecting that a peak in the first component exceeds a predetermined threshold. Amplitude of the peak in the first component is reduced in response to detecting that the peak in the first component exceeds the predetermined threshold. Reducing amplitude of the peak in the first component includes adding the second signal to the delayed first component.

Abstract translation: 对于具有第一和第二分量的第一信号中的波峰因数降低，第一分量被延迟。 响应于检测到第一分量中的峰值超过预定阈值，产生第二信号。 响应于检测到第一分量中的峰值超过预定阈值，第一分量中峰值的幅度减小。 降低第一分量中的峰值的幅度包括将第二信号加到延迟的第一分量。

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.